I've been really doing good at at tournament play but cash games haven't been doing good a y advise
Why are u good at tournaments? Do you know how to make pressure? Are you good in Push-or-Fold situations? Do you know how to play/dominate a bubble/FT situation?
I think many good (!) cash game players having a little bit skill over the average tournament player, who hopes for good cards and to stack up
Many tournament players are very weak in postflop play. That's the chance for a good cash game player (they have normally missing skills in PoF/bubble situations and so on).
If you wanna stay at tournament poker stay there and work on your game to climb up to the next level. If you wanna increase you general poker skills and becoming more better (and dangerous) in your post flop play - go ahead and train in cash game tables
Good luck and have fun!