New here, question about position sizing for illiquid assets

Been mostly focused on liquid markets like $EURUSD or equities, where standard stop-loss and position sizing models feel pretty straightforward. I'm starting to look into some smaller-cap cryptos and micro-cap stocks where the liquidity is much thinner. It seems like a lot of the usual advice about fixed percentage risk per trade or tight stop-losses doesn't quite translate when you might move the market just by entering or exiting, or where a stop might get slipped by a huge margin. How do experienced traders here adjust their position sizing and risk management for these less liquid assets without just guessing?