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 don't know if this is helpful to many people here but respectively we have particular CEX we've been using since Binance stopped P2P as a result of what is going on between Nigerian government and them. All this CEX mentioned all requires your personal informations through KYC verification. This procedures gives your data to the platform where who knows can be compromised, advice is that you don't need too many CEX, since we already have what we use, there is no need of registering for another, learn to maintain privacy.
This is helpful to so many person man, you can't ask such questions as though you're kicking against the idea and not provide alternatives. Since you claim CEX aren't that good then you'll have to provide the list of some trusted DEx that could offer better user experience. Aside the fact that DEx are know for top notch better privacy,but how about the fact that there is no support system in dex if anything goes south, I prefer the use of Cex especially for those who have been in the system for a while now.