Exchanges have different Fiat rates, what exchange are you using? I'm from Nigeria and I change usdt, btc, ltc to naira through Luno and binance most times but their rates are different, I find P2P to be better choice because you can choose rates you want to sell your coins to Fiat for, presently some are buying naira at 490, 494 and even 510, mind using binance P2P?
I use peer 2 peer also, but am not carried away by the high amount buyers offer to buy cryptocurrency in there advert, I know how risky peer2peer can be especially in peer2peer deal when no escrow is mediating/handling the deal, so I use my trusted peer2peer partner, so also you should, bianance isn't bad in peer2peer, but I haven't tried using them yet.