Larger turkish nation

How could turkey have come to incorporate more land and be more powerful? Is it possible at all?

Sure. If the Ottomans had fended off Russia in 1877, either you could have a continuing Ottoman Empire which continued to control large Balkan territories - even if the "nationalist" model had become predominant you would end up with a much large "Turkish" national territory.

Likewise, if the Ottomans had stayed out of WWI, there would probably be a larger empire - probabably parts of Northern Syria and Iraq, and possibly even Caucasian territory if Russia suffered some sort of collapse ala WWI.
 
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