I have read reply from many users and good to see that member suggested many top coins as an alternative when btc network congested for long time. I think LTC is the best alternative coins and created for this purpose. It called small btc. both btc and ltc could be hold in Electrum wallet. LTC also works on halving phenomenal and fee is very less as compared to btc. Other alternative could be Trx,bnb,xrp,doge but I think there is no coin better than LTC.