Define "Germany" and "make peace".
Germany could "make peace" at any time by surrendering.
However, one assumes that the OP means "the war ends without Germany surrendering", or with Germany surrendering with significant conditions.
If the Nazi regime was deposed by an internal coup d'état, a post-Nazi Germany might have had a better chance of such a result. This would be especially true before FDR's announcement at the Casablanca Conference that only unconditional surrender would be accepted.
After that it would be very difficult. A really clever and realistic post-Nazi Germany could perhaps have generated "wedges" between the US/UK and the USSR. For instance, Germany might offer to transfer all concentration camp prisoners to Allied custody for proper care (Germany being terribly short of food and everything else). This would require a cease-fire, or at least a halt to Allied bombing of Germany. Stalin wouldn't like that at all, but the US/UK public would want it. The Germans could also offer to reinstate Poland, including the area seized by the USSR in 1939. Again, Stalin wouldn't like that at all, but the US/UK could hardly object. At the same time, they could bait Stalin with proposals for a separate peace in the east - offering lots of cookies at the expense of allies such as Finland and Romania. Stalin might take such an offer - or else make a counter-offer that when leaked to the US/UK would make them privately abandon any pledge to the USSR
In 1941 or even 1942, the Germans would have a strong bargaining position. In the highly unlikely event that Germany passed under leadership wth a genuinely realistic view of Germany's long-term prospects, Germany could offer a lot to the Allies for a conditional peace. But Germany would have to give a lot for a little - and IMO no German regime could see its way to that. I.e. if Germany offered to surrender on conditions in June 1942, they could get a deal. But that of course is absurd. In say May 1944, a German public offer to surrender on modest conditions might have succeeded. But again, it would be ASB for any German regime to do that then; they didn't yet realize total defeat was certain.