I have difficult to convert advantage into victory, how can i improve?

https://www.chess.com/analysis/game/live/84274212601?tab=review

That's one of my last games. I think my opponent blundered with queen but I was not able to convert my advantage into a victory. I think my endgame is terrible, so do you have some advice on how to improve it? Thank you in advance

Hey how are you?

I just viewed your game , as an 1670 rapid rated player, I saw on your move 40 you could have moved your king to Kf2!! Because it stops the pawn for promoting and you got the advantage on winning.

Endgame facts

1. Get a Queen. ...
2. Create a passed pawn. ...
3. Win pawns. ...
4. Activate the pieces. ...
5. Activate the King. ...
6. Create weak pawns. ...
7. Create weak squares. ...
8. Attack the King directly.
9. Conclusion
10. Search for tactics
11. Hope this helps!!

1) Don't have doubled structure pawn in endgames and try to maintain your pawn structure

Yes, you are right, i saw my mistake on move 40th.
I think where I struggle on your list are points 2,3,6,7 mostly. Do you have some suggestions on how to improve those points?