But I think to redeem bonus 40x wager is way too much as a starter , keep it to 5/10x and an option to withdraw profit will likely great for user's.
You won't have much luck finding crypto casinos with wagering requirements of 5 to 10x. The standard is 30x to 40x. Some are below that, like 20-25x but I have also seen online casinos requiring playthroughs of 60-80x and more.
even if you find some place with wagering requirements that low (10x), in my experience those numbers are misleading as they don't count your wager at 1:1. and if you do the math you will find the real wager needed is much higher than what is advertised.