Could I have won the endgame?

I didn't leave enough time for the endgame because I thought my opponent wouldn't resist my kingside attack, but he found the right defense and in that time trouble I blundered my endgame position. Anyway what do you think about this endgame? Do you think I have serious incompetence in something or is just a natural mistake? en.lichess.org/3B3AhimK/black#84

Well, at move 42 the pawn was moved instead of moving the king. I did the endgame and saw that with all stockfish recommended moves you would still be up a pawn so yeah i think you couldve won that.

Just a natural mistake under time pressure bud IMO.

Exchange addiction is your problem in this game. Learn to keep the tension.

To answer the question asked, is the ending lost?

I think the key issue is that the white bishop covers the g1 square. So black can't just push the g pawn the way up. So the white a pawn needs to be stopped first. But after 43. a4, the black king can't stop the a pawn anymore.

So the question is more at what is the ending still good for black?

I think at move 36, if black centralises the king, brings the knight to c5-e3, pawn to b3, then it should be winning. Black is a clear pawn up.

I'm mixing up my board coordinates. I meant:

I think at move 36, if black centralises the king, brings the knight to b4, then it should be winning. Black is a clear pawn up.

Although looking at it again, it looks like the white king can grab the e4 pawn still. So even at move 36, its still looking fairly equal.

42... Ke6

I made some moves and it ended as a draw. I dont't think after 42. Ke6 another result can be shown but draw.