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So let's say that Charles gets fed up with the ottomans being worthless and decides to return to Sweden(specifically Finland) to once more lead his armies.
Since he returns right after a major victory Swedish moral is still fairly decent, and he mobilizes all the remaining troops in Finland, which number at least 10000. Let's say he crushes the invading russian army preventing the disasters at Palkane and Storykyro. This victory gives Sweden some much needed breathing room and Charles orders Field Marshal Stenbock to begin a new offensive against Saxony.
With Russia being temporarily stalled and after having failed at Helsingborg and Gadebausch Denmark decides that this is not going be easy as they hoped and they once again make peace. Stenbock has at least 9,000 troops and should be able to heavily damage if not outright defeat them(Gustav Rehnskold was able to defeat a Saxon army twice the size of his own with only 9,400 troops in the battle of Fraustadt).
If Denmark and Saxony are once again out of the war I don't see Hanover or Prussia-Brandenburg joining against the Swedes. This would leave Russia all alone to fight King Charles. Due to the allotment system he would be able to recruit more men to replace the army he lost at Poltava. With new victories against the Russians the Ottoman Empire might even consider joining the war on Sweden's side.

If Charles were to return to Sweden after Gadebausch rather than in 1715 in real life do you think that Sweden would have been able to keep all their German possessions, Estonia, Livonia, and also remain a great power?
IMO his greatest mistake was wasting time in the Ottoman Empire, after they had proved to be fruitless allies. Sweden, aside from Stenbock was deprived of strong leadership that saw all of its Baltic possessions overrun.
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