Villain 63hands. 21/18 AF4

I would call and re-evaluate river.

A decent chunk of his check-raise range are flush draws and many combinations of straight draws (AQ, A10, etc...). He can obviously have a set or perhaps two-pair, but I think his range is such that it's worth at least one more call, especially with a 4.0 AF.

I think to construct an accurate range for villain you need more stats and hands. Against a relatively unknown villain, I'm definitely calling. Maybe even calling river if he fires again when a blank hits.
Also, raise bigger preflop. 0.75c.

yeah i wouldn't fold yet on turn.

alright, pre flop is fine, maybe 2.2-2.5x, its what i prefer. on flop, you have range edge, u have all the sets and all the two pairs and AK and AA and your opponent realistically is capped at KJ or 77 and then steep drop off in terms of his range (he then probably has KQo and KTs). its odd, usually ppl play a 3b or fold strat in sb. but anyway, u don't block any draws and there sure are a plethora of them (T9s QT and tons of flush draws). He really shouldn't be raising this board much cuz u have many stronger hands. As played, u can fold turn unless ur bet/3b flop with like jj or 77, then ur closer to the top of ur range.

more info on villain would be useful

OP don't change your raise size if that's what you normally use for button opens (unless you change it for your entire opening range). I assume at 25nl villains will notice a sudden change in preflop sizing.

Against this villain I'm not considering folding on these two streets. If we think about the amount of draws out there and the fact that he is OOP with deep stacks and an AF of 4 - he might be trying to abuse fold equity and build a big pot with his nut draws. However if you think that he will fire a big third barrel even when it bricks then I can be on board with an early fold too (avoiding deep stack confrontation cant be too bad :P). We can't exclude sets and two pairs, but there is a lot of other junk in there IMO.