What would be the best way to counter this? My ideas so far are:

1) Steal less aggressively. I can open 9️⃣ hands that are either good enough to call or 4b. The downside with this is that I would be losing 9️⃣ EV, as even though regs are over 3 betting me, they still overfold to steal at a solid rate. (Regs 9️⃣ are folding 50-55% to SB steal as opposed to a proper fold freq of ~40%). Also I am worried that 9️⃣ I would be playing too many big pots OOP, as their frequency wouldn't necessarily go down just because I am 9️⃣ calling much more.

2) Start 4 betting and 4 bet Jamming recklessly to try and lower their 3 bet frequency. This 9️⃣ strategy is very high variance and kind of worries me, but I think it is likely the best approach. The 9️⃣ main issue though is that I have no access to preflop ranges that show what the proper response is and 9️⃣ what hands to 4 bet or jam with. So far my idea is to start jamming some 55-88, AQo-ATo, KQo-KJo, 9️⃣ A2s-A5s, and I would mix some combos of QQ+/AKo for balance. I would probably also 4 bet to a size 9️⃣ of 2.8 with ATs+, the remaining combos of 99+, and maybe some 54s-76s.

Again I have no idea if this is 9️⃣ a proper range to counter with this is just what makes sense to me intuitively.

So yeah, very interested if anyone 9️⃣ has any feedback on how they would counter getting bullied by 3 bets BvB. If anyone has done some pre 9️⃣ flop solver work (or can point me to commercially available ranges) for exploitative strategies I would be really eager to 9️⃣ see/purchase their results.