Live £1/2 full ring

I opened to £10 from UTG+1 with A5ss
MP called/button called/SB(about £350 starting stack and I covered him)
Pot:£42

Flop: 4s4d6s
Checked to me I bet £30
MP and button folded
SB called
Pot: £102

Turn: 3c
Sb checked and I bet £70
Sb called
Pot: £242

River: 8d
Sb checked again

Bluff or give up?

SB is a bit fishy and been overcalling in many spots so it led me more into giving up as it seems like a 6 to me and the only real chance he would fold is to a jam

I don't like opening A5s in EP, though the game seems pretty deep so maybe sometimes.

This multi-way with the NFD on a paired board, I don't c-bet. A free card would be a great result for our hand, and LLSNL Vs are notoriously cally with on paired boards. I don't expect any 6X or PPs to fold to this c-bet, but they'll often check back.

AP to turn, I don't mind the barrel, but I'd size it down. Half-pot should be fine.

AP to river, you have very little SDV, but you do beat most of his busted FDs, which is pretty much all he's folding after calling this much so far. A bet might get 55 or 56 to fold, but you block those so there's not a lot in his range. If he was calling with any 6X that didn't also have a draw, he's probably too sticky to fold it on the river. As much as it sucks, I prob give up here.

Mostly though, I don't like how you got there. None of the decisions is awful, but all of them to this point are on the over-aggressive side of reasonable, and that gets very expensive.

i mean if he is really that sticky you can probably pass on bluffing him.

your flop bet and turn bet were fine you had a huge draw, but only had ace high so why not bluff if try to get him off a made hand. and incase he calls you can get there