AJ 3bet pot call down?

PokerStars - $1 NL FAST (6 max) - Holdem - 6 players
Hand converted by PokerTracker 4

Hero (BTN): 104.52 BB
SB: 100.5 BB (VPIP: 15.91, PFR: 12.12, 3Bet Preflop: 7.02, Hands: 139)
BB: 134.9 BB (VPIP: 20.16, PFR: 17.70, 3Bet Preflop: 8.51, Hands: 1,176)
UTG: 101.39 BB (VPIP: 20.75, PFR: 16.35, 3Bet Preflop: 8.20, Hands: 167)
MP: 58.15 BB (VPIP: 14.81, PFR: 11.11, 3Bet Preflop: 11.11, Hands: 28)
CO: 109.11 BB (VPIP: 11.68, PFR: 7.61, 3Bet Preflop: 2.38, Hands: 203)

SB posts SB 0.5 BB, BB posts BB 1 BB

Pre Flop: (pot: 1.5 BB) Hero has A♦ J♠

fold, fold, fold, Hero raises to 2 BB, fold, BB raises to 8 BB, Hero calls 6 BB

Flop: (16.5 BB, 2 players) 2♥ 5♣ 8♦
BB bets 9 BB, Hero calls 9 BB

Turn: (34.5 BB, 2 players) J♦
BB bets 19 BB, Hero calls 19 BB

River: (72.5 BB, 2 players) 6♣
BB bets 70 BB, Hero calls 68.52 BB and is all-in

He 3bets vs BU 19%. Cbets flop 71%. Turn 33%. river no info

Is it ok to float, since he might give up turn? and could continue bluffing if I hit J or A?

Fold river? Somehow, doesnt make sense to fold when I hit on scare card vs 19% range, but I noticed the following in my 50k hands in NL100

1) People super rarely bluff 3 barrel in 3bet pots. I dont know how to adapt to that, since whenever I call down I lose nearly always.

2) Most people rarely just cbet flop and give up. Most of them, bet flop and turn and then give up or shove for value. Many of them, bet flop c/c pr c/r turn (As I do mostly), so it makes floating even more difficult. It means that I would have to call flop and turn and fold river with AJ. If they most of the time bluff flop and turn and give up river, it means that I can float flop and turn and bluff river when checked to? Still, some people hit on river and then c/c.
This especially is hard when I am oop.

My possible adaption:
a) float equity hands, bdfd,gutshots and shove turn vs such player. And with overpairs and TPTK (as this hand) shove for value on turn.
b) construct value and bluff raise range on flop.
What is better in your opinion, or better advice?

I also noticed something in 2bet pot:

3) People really rarely bluff 3barrel even heads up, or for thin value 3 barrel. It is so extreme, that I see so often even two pairs check behind river, or TPTK check behind. So, most of players pot control one pair hands and bet only nuts. They bet flop and turn with equity (gutshot, or bdfd, fd) and on river they give up unimproved.
This really makes difficult decision on river vs most of the opponents, so far I was bluff catching with TPTK or TKGK, but I noticed that I super rarely win with those hands on showdown.
So I guess, I should fold TPGK by the river vs most of the guys? most of the people are relative unknown (I dont have sample on river betting frequencies) so it is hard decision each time, just general population read is all I have.

4) Most of the people, rarely bluff raise. When they, do it is mostly with a draw vs my overpair or TPTK has 70% (not a huge favorite, and when they have set I have almost 0%). Also, they dont bluff the river, just flop and turn. So far, I was folding vs raises on flush rivers or turns, but calling down on blanks. I guess I should call turn on blank and fold any river with those reads?

5) Lately, when I am PFR and somebody cold calls me, they fold quite often, and when they dont it is mostly nuts. For example, when I have AQ on Axx, I just feel on flop that I dont have even one street value (especially when I am early position). The reason is that, most of people dont cold call AJ, AT, and weaker (exept fish) but they fold or 3bet, so I think they mostly have PP in their cold call range and thats why they fold so often on flop and continue only with nuts?
I try adapting to this by c/c flop, but in NL100 people know I have the hand when I check Axx, Kxx, Qxx, Jxx so they check behind and give up turn. So I basically just started betting for protection (not for value) on flop and pot controlling turn and river (still they have mostly nuts when they bet). Also, on Axx - Jxx I started just checking (not cbetting) and delayed cbetting turn since it works so well, with all hands with little equity.