Villain is a fish

I dont think we need to be 3betting against a fish, but our hand has a decent playability and being in position against one fish in a bigger pot.. was enough for me to justify a 3bet. Taking into a consideration the rake factor as well.. however, player on the BB seems to be fishy as well, soo maybe given this fact, I am better off just calling and playing IP against weaker players.

I used to simplify my strategy and bet 1/3 with my whole range on most runouts. This flop is actually slightly better than the average one.. he can not really have AA,AK,KK,QQ (but yeah he has 66 and 33 which we dont, thats why its just slightly better)

Our hand didnt improve.. and we exploited the hotspot on the flop - it is not that lucrative for us to bet the turn even in terms of fold equity. I do check a decent amount of Ax hands (maybe all of them except of twopairs and AK)

After he bets 1bb/checked he usually dont have the Ace, but rather some showdown value - I perceived it as some paired hand which want to avoid a bigger bet. I do not really think we can fold.. I mean he is a fish and can have even some busted flush draws, we need only 3% to call so, we can justify calling at least. Unfortunately, the ace is reducing number of Ax hands which we can have, but I am pretty sure that still it supposed to be a bet in theory and I would be really inclined to bet this hand, but against a regular player. Vs a fish I am pretty concerned, just because I see a lot at these stakes that fishy players are often not capable of folding here with almost any paired hand. Yeah, he sometimes do have KQ,KJ stuff, but it might be also tempting for some to make a hero call.
My adjustments against a volatile in this hand would be: betting 2streets for value even with JJ-KK,KTs,QTs, 3 streets with A9 or AJ (at least), avoid bluffing at all (on the river) or really rarely make a bluff

Would you bet the river vs a fish/reg?
What do you think about my adjustments?