Props for heart, it’s a big bluff to make. Not sure I love it, though.

I don’t think there are too many tables tight enough to justify opening 53o in MP. 53s maybe, but you’re taking it way overboard here. You will have to play postflop sometimes, after all, and you have blockers to many of the hands your opponents will fold.

I’m not sure what you mean on the flop by “I block 2 overs”. You don’t block anything except 5x and 3x hands.

I guess flop c-bet is fine since you have no other way to win the pot and this is the nut worst hand in your range, I hope. You do at least have a backdoor straight draw or two.

You do have some AK in your range and perhaps some QT or QJ, but you don’t have much in the way of sets or 89, which is a little problematic when it comes to actually getting villain to fold. Villain’s range here is probably stronger than you’d think – you’re most likely correct that they’re not betting much Jx for value, but they’re also not likely to be turning many hands into bluffs very often since low-stakes players just don’t do that anywhere near enough.

If that’s the case, we have to look at villain’s value range as being Qx hands or better – there aren’t many single-pair Qx hands in there, though, so it’s JT, T7, QJ, 98, and any slowplayed set. If the table is as tight as you suggest, villain may also have TT in their range.

Essentially it’s a question of, what do you realistically expect villain to bet-fold here? It’s obvious that 53o is one of the worst bluffing hands in your range since you block nothing, so we have to look at this purely as an exploitative play, designed to exploit a tendency on the part of villain to bet-fold this spot too frequently. Since villain’s betting frequency as a bluff is much lower, their betting range gets stronger, which means we have to be able to get them to fold a good % of their value range in order to make this work.

In this spot, I’m not convinced that’s going to happen. Low-stakes villains hate folding 2-pair or better and the guy just doesn’t have a lot of one-pair hands here. It sort of seems like you just opened a really trashy hand for a pretty thin reason and then tried to find a way to win the pot at all costs postflop. I think folding river here is probably better, but it’s good that you have the ability to pull the trigger.