i agree when the king is exposed as it was in this case, taking the pieces off the board are that are the biggest threat to the king is probably a good idea since the king was hemmed in a little...especially the queen and bishop when they were removed they were both a major problem aslong as the rook had the open file..and the knights looked dangerous while they were on king side as well...simplification may well have been the best thing you could have done here... however i'm not all that strong a player myself...but i think you did right there...however i think if you'd activated your knight a little earlier after all the other exchanges the position may have been much better for you as the end game looks lost once he gets his rook down to your side of the board
Slowly and mercilessly grinding me down
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I think you played a good game, abeit a little passive. As Tonydal pointed, it's often a good idea to activate your rook in rook endings trying to take some opponent's pawns, even if it means losing some of yours.
Activity is key in rook endings, and you can often draw one pawn down.
With this in mind, maybe 29.Re7 is worth a look.