In position at 500bb against an honest 3-bettor, calling is close to the whole strategy.
4-betting narrows to the very top; suited hands with nut potential call more. The question on every street becomes: which hands are happy getting 500bb in?
The small blind 3-bets your cutoff open — a range built to play fast, because playing slow out of position deep is misery.
Assumes a standard 3-bet; 4-bet to ~2.2–2.5x the 3-bet. Deep, favor calls over 4-bets — a 4-bet pot at 500bb+ commits you with range disadvantage.