In the following (now finished) game, I was unsure at this point how to proceed. One thought was to take the pawn at d4 with the rook, in order to entice a rook/rook trade since I'm up on material. But I was also thinking that I could use my advantage at that point to start pushing the abc pawns.
I ended up taking the pawn, and it worked, but I'm still not sure what the best approach in that situation was. Despite being ahead, I had no idea how to organize my forces into a coherent attack.
[FEN ""]
[StartPly "53"]
[StartFlipped "1"]
[White "SpartanDonut"]
[Black "almo2001"]
[Result "0-1"]
[WhiteElo "1085"]
[BlackElo "1143"]
[TimeControl "1/604800"]
1. d4 d5 2. Bg5 f6 3. Bh4 Nc6 4. e3 Bf5 5. Bd3 Nh6 6. h3 e6 7. Nf3 Nb4 8. a3 Nxd3+ 9. cxd3 Bd6 10. Nc3 O-O 11. e4 dxe4 12. dxe4 Bg6 13. O-O Be7 14. g3 f5 15. e5 Bh5 16. Kg2 g5 17. Qb3 gxh4 18. Qxe6+ Kg7 19. Nxh4 Bxh4 20. gxh4 Bf7 21. Qf6+ Qxf6 22. exf6+ Kxf6 23. f4 Rad8 24. Rad1 Bd5+ 25. Nxd5+ Rxd5 26. Rfe1 Rfd8 27. Re5 Rxd4 28. Rxd4 Rxd4 29. Kf3 Nf7 30. Rb5 b6 31. Ke3 Re4+ 32. Kf3 Nd6 33. Re5 Nc4 34. Rxe4 fxe4+ 35. Kxe4 Nxb2 36. f5 Nc4