Really just play the long game against Britain. Submarine warfare, Commerce raiding by sea and air, S-boats in the channel, air mining. Germany could stick to air bombing military targets and not invite retaliation (plus trying to look reasonable).
Don't even think about trying Sea Lion. Any Battle of Britain should be a light version. Keep economic disruptions minimal and reduce attrition. With the bases Germany already has the war cost to Britain is enormous, just living month to month.
Politically come to some sort of reasonable peace with anyone willing to make it. (France, Belgium). (trying to look reasonable again). 1913 boundaries plus reparations, 20 year occupation of Briery basin, military restrictions, return of POWs etc (occupation to continue until general peace).
Support Italy to the extent that you have to only (In such a TL Italy may not invade Greece as Germany does not have to move into Romania).
In short, reduce your overall war cost, be willing to play out several years, Britain has to make peace eventually. Politically settle for a 1913 in the west and a free hand in the east. Be politically reasonable and don't try to escalate (helps keep USA out).