I'm no stats expert but I'll give it a shot.
1 - It appears as though you aren't being aggressive enough. Both indicated by your low AF (IMO, a stat closer to at least 2 is much better) and you don't c-bet that often, but that could just be a function of table selection. Obviously at looser tables, you are going to get fewer opportunities to make c-bets.
2 - I'm not totally sure what an "optimal" WTSD number is for a TAG, but 30% seems like you are waiting for strong hands only. As a result, you are probably taking passive lines in which villains are forcing you to fold the best hand on later streets - maybe they aren't doing it on purpose but it's possible you just underrep your hand or are afraid to bet for value, so they make what they think is a value bet for their own hand, and you fold. You can improve this by working on
Hand Reading and looking for spots to stay aggressive. Trust me, when people can beat one pair, they'll let you know.
3 - Finally, look for opportunites to steal more when folded to you in the CO or BTN. It's great that you are positionally aware and are playing more hands in LP than from EP, but I think 18/14 still has a lot of room to open up. You do this by
Isolating Limpers and winning more pots without showdown,
Stealing Blinds when tight or bad players are in the blinds, and playing positional poker where you do things such as
Floating or pushing a strong
Draw.
I realize this is 10nl though. The biggest 2 concepts you should be focusing on are
Value Betting and patching up
Common Leaks such as not folding enough or folding when you shouldn't.
Best of luck to you.