I think the best way to start to fine-tune your game is to plug hands into Cepheus's strategy interface. It is pretty unintuitive but fairly easy once you get used to how it works. Think you're folding too much? Plug in some hands where you think you may have wrongly folded and confirm. You can also see how Cepheus plays its whole range there, so you can start to develop a sense of what hands should be continues vs. folds.
You can also just start by playing around with some board textures in your most common spots, e.g. out of position vs a flop bet, in position facing a check-raise, and in position vs a pre-flop 3-bet facing a flop bet. You can probably learn a lot just from examining some archetypal boards.
As an immediate, practical piece of advice, I'd say play a bit tighter, especially OOP, than Cepheus would. This is especially true if you're playing too weak-tight post. The weakest hands really depend upon you eking out as much equity as you can post-flop, and even then they're really marginal. You can lop a lot off the worst offsuit hands off your BB defense range and you'll be just fine, i.e. hands like J2, T3/2, 93.
