I would take a look at the thread EndlessRain linked to, we've put together a pretty good compendium of setups, combo's, and traps there. It's also probably for the best if we keep general discussions like this centralized to one thread so the information is easier for others to find.
Based on your description of your own habits, I would advise you specifically to try being more aggressive at times. In general fox doesn't do too well when you try and force a kill move through, but it sounds like you tend to play very cautiously, so your opponents may not be ready for you if you suddenly go for a risky move. I'm not saying you should just toss our raw F smashes and get punished, but sometimes the safe option just keeps your opponent alive longer, and the rage mechanic can really work against you. Consider just how much you will actually get punished for a greedy move, if you're still at low % and they are in rage mode, Up Smash out of shield will either kill them, or you will take a moderate amount of damage. Up Air is also pretty hard for some characters to punish heavily, if they dodge it or hit you away Fox's fall speed will get you out of their range very quickly (this depends a lot on the situation, percentages, and match up. Use common sense to avoid getting spiked, or killed off the top during a stage transition).
Of course, this is all just theoretical. You seem to be doing pretty well, better than I do for sure.