I hope they will reduce minimum withdrawal amount for ETH again when the GAS fees drop a lot, as 0.1 ETH is high.
Gas fees probably won't drop anytime soon. I do admit that they are high, but I don't think that the minimum withdrawal of 0.1 ETH is high at all. It's around 20-30 bucks which is reasonable to be honest.
If you wager small amounts, just stack your balance until it crosses that minimum withdrawal threshold and then proceed to withdraw. This is what everyone usually do.