The system reshuffles to make a fair markeplace for everyone, you can't decide to trade with a particular merchant, except you're engaging in offline or WhatsApp trade.
I thought in the case I have described, you can search for the merchant ads on the P2p platform within systems and go ahead to trade with them. Isn't this another way it can be done once you have traded with them before?
There are not search button on Bybit p2p marketplace only filter button. You can not search any merchant of your choice. You can only trade with options you're provided for.
The only way you're likely to see vendors you've traded with before is if you followed their profile.