Alternatively getting rid of Hitler but then, given the grip that he had on much of the Nazis and German system, would only be available later in the war. Difficult to see this happening much earlier than the historical plot, especially if the Germans are doing better in the east because of the reduced L-L to the Soviets.
There were several major attempts by the military German Resistance to assassinate Hitler and then coup the Nazi regime well before July 20, 1944. Some of these attempts occurred on
March 13, 1943 and on
March 21, 1943, and only failed because of minor random butterflies (the same kind who had saved Hitler on November 8, 1939 and shall save him again July 20, 1944). The early 1943 attempts were especially noteworthy for out PoD.
They occur at a time when the military situation on the Eastern Frornt was such that Stalin would be highly receptive to a reasonable separate peace offer that would leave Central and Eastern Europe free from Communist control (OTL there still were peace feelers between Germany and the USSR).
Restoration of 1941 borders is certainly achievable, possibly something substantially more (IIRC OTL pre-Zitadelle peace talks were about German requests for a border on the Dvina-Dneiper, while the Soviets asked the resotation of the 1941 borders) especially if something like the discovery and confirmation of Soviet responsibility for the Katyn massacre causes the L-L to USSR to be drastically dropped and/or the post-Nazi military junta fully adopts Manstein's elastic defense strategies on the Eastern Front.
With either or both events, it is quite reasonable to assume that the Spring-Summer 1943 would lead to a bloody stalemate on the Eastern Front which leads to a separate peace (depending on how the spring-summer fightings went, it might be the Dvina-Dneiper, the 1939 borders, or the 1941 ones). Now, the Western Allies are facing a rather bad confidence crisis about their "unconditional surrender" policy. Their only perspective about enforcing it are several years of a terribly high "butchers' bill" and possibly bloody failures at landing in mainland Europe, while they wait for the success of Project Manhattan.
It's rather unlikely that the Congress, the British Parliament, and the Anglo-American public are willing to face the costs, now that the Nazi regime went down (the main and minimum war aim for the Western Allies), especially if the German government goes public with a negotiated peace offer after the German-Soviet armistice. No doubt the German military junta asks for garantees of German national unity, territorial integrity in their ethnic 1939 borders, plus the 1914 borders with Poland and a sphere of influence in Eastern Europe, and offer to withdraw from Western Europe. The WA ask for a thorough denazification, demilitarization, and occupation of Germany by the Anglo-Americans. Negotiations stalemate and break down temporarily, but are reopened when the landings in Italy show up to be a bloody failure and/or the Italian front bogs down in a bloody stalemate.
Renewed negotations agree on the following terms: Germany evacuates Western Europe and maintains temporary occupation of Eastern Europe until Anglo-American troops can take their place on the Soviet border. Allies can supervise the denazification effort and the democratization process in Germany, as well as manage the trials for Nazi war criminals (the ones that the Junta has not yet executed, that is). German troops withdraw within their borders and make a gradual demilitarization. Germany keeps Austria, Sudetenland, Danzig, Upper Silesia, and West Prussia. Italy signs a similar peace deal and evacuates everything it occupied since 1939 (but keeps her post-WWI eastern borders).
By November 20, 1943 WWII in Europe has come to an end. Czechoslovakia (minus Sudetenland), Poland (minus the Corridor and Upper Silesia), Hungary, Romania, Yugoslavia, and Greece are occupied by the Anglo-Americans and gradually restored to independence and democratic governments. Depending on how good the negotiations with the Soviets went, the Baltic states, Moldavia, and Eastern Poland may or may not be within the liberated zone, too. Some unpleasantess occurs in Yugoslavia and Greece when the WA put down Communist insurgencies by force. Stalin is quite annoyed at having the Americans on his border (and possibly about being denied his previous 1939-41 conquests), so he puts the Cold War apparatus into full gear. He shifts his troops into the Far East and attacks Japan. More limited Communist insurgencies occur in Italy and France, which the WA put down by force. Germany and Italy undergo supervised democratization and demilitarization: both elect Parliaments with a Democratic Cristian and Socialist prevalence.
In Asia, the Red Army invades and occupies Korea, Manchuria, and Northern China. America shifts here the vast majority of her military potential (minus the necessary for the occupation armies in Europe and to man the Soviet border) and by the end of 1944 is able to conquer Japan with a series of successful yet quite bloody landings. Plenty of American support goes to Nationalist China to oust the Japanese and the Chinese Communist from Southern China. Mainland China gets effectively divided into a Communist North and a Capitalist South. American troops cooperate with the British, the French, and the Dutch to put down Communist insurgencies in SouthEast Asia, then these countries are put a controlled decolonization path as part of the Western Sphere of influence.