Preflop
There is no need for a limping strategy from BTN, when you are playing with deep stacks. This is something, good players will occationally do with 20BB but not with 170BB. If you want to be loose, you can raise all suited JX
hands and J9+, but J4o is just garbage and should be folded.
Flop
Obviously a good flop and especially with stacks this deep and in a freeroll I dont see any reason to just bet 1/3 pot. While you are almost certainly ahead now, there are many future cards, that are bad for you by completing draws, counterfeiting you or creating possibilities for a better two pair. So you want to get as much money as possible into the pot right now, before the board screw you in some way.
Turn
65 got there, but thats just one hand, and you are highly likely to still be ahead. So once again I would go larger like maybe 2/3 pot on both flop and turn. Or you could take a more exploitative route and overbet both flop and turn, if you think, he is never folding top pair or a draw.
River
Now the board got significantly worse, since any 6 now has a straight. This is really bad for you, because you could be beat, and its much more difficult now to get paid by worse hands. Therefore it makes no sense, that you ramp up your aggression and overbet the pot now. Its probably still fine to bet something like half pot to try to get a crying call from top pair. But when you overbet, any sort of decent opponent will only give you action, when you are beat.
You do overbet though, and now you get raised. This is usually a fold or maybe a call against some opponents, who
bluff a lot. But its never a 3-bet. The only hand, you possibly beat now, is a bluff, and he is not calling a 3-bet with a bluff, even if he is getting a good price. And he is also not folding any hand, that is better than yours, so you can not turn your hand into a bluff. What on earth were you thinking here? You cant use tiny bets on the early streets and then start piling chips in on the river, when the board has run out in a way, that is really bad for your hand.