Ignition $11 5k on a Sunday

Mp open limps 125bb stack, starting stack.

Btn limps. I complete Sb with As6s (Ginger, what are your thoughts on this spot, in general. I used to want to overpot iso a lot of the time here because I’d get called by one player, usually a weaker one because better players wouldn’t make this spot in the first place. I used to feel a lot more confident, even out of position, in this situation. Sometimes I’d check/call three streets with any pair and win 50bb river bets vs a range that’s basically some strong hands and a ton of air)

Bb checks.

So everyone’s ranges are middling and not strong, but could contain middling pocket pairs.

flop Ac4c9s. (4bb)

I check (to check/call, or value bet turn). BB shoves 124bb. Folds to me. Button actually tanked into their timebank. Sorry if this is a super easy fold, I just noticed this situation happen the last few times I’ve played.

The wildest, yet balanced opponent in this situation could have A4, A9, 94, about 80 flush combos, 44, 99. I think that was like 60 combos of value that beats me for idk 90% equity, and 80 combos of draws that have 35% equity against me. Versus that range, I guess I should be calling, but while I can see someone shove every of those value hands, I don’t see them simultaneously shoving every flush draw.

If a pro thinks I’d be better to spend time thinking on more common situations, say something. This happened 3 times in the last week, and I don’t play a lot, so I thought maybe it’s becoming a thing fishy rec’s do.