Hey Michelle!
The one tip I would have for Brussels sprouts is try cooking them on a higher temperature for a shorter time, I think the outside would be crispy but not dry out the inside too much. Remember it’s a vegetable ane doesn’t need to be cooked very long to be delicious if your Brussels sprouts are dry inside it sounds like they were just cooked too long. The air fryer is a small convection oven, it cooks with hot air circulating, so you can easily dry out food if you time it similar to a regular oven, air fryers cook at a fraction of the time. Hope that helps!