That being said, not every platform offer the p2p but just a few. Some people decide to use the local vendor which we all have to be very careful while dealing with.
Well here are some exchanges that still offer p2p in Nigeria that I was able to find out.
Quidax
Bitget
Bybit
Remitano
If there's anyone that isn't on the list please tell me I'll add
I'm not finding it interesting gathering the whole of exchanges offering Nigerians the p2p in an extraordinary. I'm most concerned about the platforms reputation and when I get one, I don't bother looking for any other because greeds are usually come as unsatisfactory which could lead us to regrets.
However, I goes on my p2p with the Bybit and the Bitget. I don't know about the Quidax neither do I care to know more.
I'll also advice you to be careful when dealing with the local vendors because, in a platform Involving funds can be skeptic about users reliability where there'd be no escrows.