I just wanna make some sport bet but I don't know which site i should join, I think that I need some suggestions from you guys 
. I used to play on Directbet but they have closed and after that I don't play in any betting website
You can try nitrogensports because they are good alternative for direct bet and I have also started using them after directbet. . I used to play on Directbet but they have closed and after that I don't play in any betting website @OP I think sportsbet.io have higher limit according to this post https://medium.com/sportsbet-io-blog/bitcoin-sportsbetting-with-sportsbet-io-60448aa86769
Quote
Our betting limits start at 1 mBTC and climb all the way up to 100 BTC for hundreds of pre-game and in-play betting options that include: