How could I have beat the Computer here?

Looks like a well played game. It must be hard to draw 2500 computers. You probably are way better than your rating suggests.

As you said in your post, you were a piece up but his rook was more active.

You might have had more chances if you had tried to activate the c1 bishop more. Plus, why did you go for the repetition? You were a pawn up according to the normal material system, and even though his rook was more active, you could have tried for counterplay against his pawns.

Well played on drawing level 8.

Thanks! Yeah I tried to activate my Bishop with b3 but then he played Rf3 putting pressure on f4 making it difficult to do anything with my extra piece. So my Rook and Bishop were tied up defending pawns and my King was cut off so I just went for a draw. Also I haven't played a lot of games on chess.com so my ratings aren't accurate.

Level 8 is the highest they have on lichess and the rating they have posted is 2500. Their rating system might be different but it still played much better than 1700.