Their 3-bet attacks your width, so continue wide: 4-bet a real range, float the suited playables in position.
The reference tier. 4-bet a tight value range, call with hands that flop well, fold the rest without ceremony.
You opened the button wide; the small blind 3-bet, as they should. You hold position and the wider range — both matter.
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.