i also suggest Orbit Exchange via BetinAsia or bet-footbal
or new solution from Sportmarket called Traderplace. Which is full clone of betfair exchange

crypto alternatives are no solution at the moment in my opinion. Lack of liquidity and user are one problem, and the offer of Games/leagues are a problem at the moment.

Here in forum one solutions seems nice, but has same problems at the moment. maybe in future they will improve (exbet.io)