Perhaps wrong trades in the game.
A game in the slav
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What did you intend with 11. ... c5?
That sets white up to push d5.
It also gives white d6. Both bishops were vying for that, but after you voluntarily cut off your bishop, it's all white's now. White had a great opportunity to either trade his knight for your bishop with Na2 or force your bishop to a worse position with Ba5.
With good play from white at that point, you should have lost your c4 pawn *and* had to deal with a white pawn deep in your territory.
Usually, a pawn break means a pawn push that you can support. 13. ... e5 is just trading it away.
Instead, cxd4 would have helped your bishop get back into the game.
This is a game I recently played as black using the slav defence.
There were several issues in my play that game. However they seemed to mostly stem from my playing of c5 and then e5 to early. In the slav pawn structure, the e5 or c5 break is one of the main themes. Knowing this, I played those breaks basically at the first possible moment. However, this seemed to weaken my central light squares allowing Nb5 and later f2-f4-f5 winning the bishop. What are some things that I should consider before making this kind of pawn break in the future. Thanks.