My first bitcoin buy from Local Bitcoin and it was my favorite p2p site. But I don't understand why and what is the main reason to closed buy/sell service by local bitcoin?

don't worry, binance has a good p2p platform (better than localbitcoins has)
Take note that Binance is not a p2p exchange, if you are looking for options of p2p exchanges, then look here:
https://kycnot.me/?type=exchangeBinance is a centralized exchange that collects kyc and is a third party in every trade you make in their platform. The 'p2p' in Binance is not true p2p because you are not connecting directly to the other peer and you don't have control of your funds when you are trading.