Should be a new wave of bitcoin maximalist coming from etf buyers, they will have more buying power then the average new retail entry and will be faced with the difficult reality of kyc.

Truck bed full of money. Meeting place in the desert. Armed friend accompanying you

I gave a joke answer but the actual answer is all the tiered amounts will use basically the same tools, like bisq, they'll just need to do transactions in small enough amounts at a time for the market to handle. If they're a really huge buyer, they can make bigger and bigger orders over time, with the market's capacity increasing to eat up those orders. That would also push their buying price up, but big time traders already understand that part of the game.