Make sure to use your king! When all else is equal, the side with the more active king will get the upper hand. If you're unsure how to evaluate a knight endgame, try to see which king is closer to the center or queenside -- the closer king will be able to contribute to the action first.
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[Event "U.S. Championship"]
[Site "?"]
[Date "2019.03.31"]
[Round "?"]
[White "Perez, Lenier"]
[Black "Gareyev, Timur"]
[Result "1/2-1/2"]
[Annotator "David Hayes"]
[BlackElo "0"]
[FEN "8/8/7p/5k1P/3KN3/8/8/8 b - - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
1... Kg4 2. Nf6+ Kf5 3. Ne4 Kg4 4. Nf6+ Kf5 5. Ne4 Kg4 { Draw by repetition
of position. } 1/2-1/2