Razer Wolverine V2 Pro for PS5 - I bought one on ebay awhile back. I think they were $250 new, I paid $90 or $100 I think. Here's one example for about $70 shipped:
https://www.ebay.com/itm/860095960910
I also picked up a usbc -> usba dongle so that I can use the front ports of the PS5, which are only usbc - 4 pack, only using one of them, the rest go into my goodie box of parts.
https://www.amazon.com/dp/B0F9YFLVJN
This adds 6 extra buttons. Two additional on top, near the triggers. 4 underneath, two on each side. I can't reliably use the ones underneath individually (most likely a human coordination fault) - for Crimson Desert, I bind the right side underneath to X - start running or hold to run, freeing up your right thumb for the stick. The top left side, near the two triggers, I bind that button to down arrow on the d pad. Lock on to target. That keeps your left thumb in place on the stick. I don't use the bottom left buttons nor the top right button.