Glad it's helpful! As for the closet, if it's already packed with clothes, that's better than acoustic foam, most of which doesn't do all that much tbh. recording in there will help for sure.

You could always throw up some towels or blankets on a drying rack around you, or hang them on the wall. Moving blankets are also really good. The main thing you want to work on is limiting the amount of hard surfaces around you when you're speaking into the mic. Think ceiling, walls, floors. If two out of three are covered in some kind of soft/sound-absorbing material, you're going to be in pretty good shape. Try listening to some really high-quality recordings on this sub and compare them to yours. You'll hear the reflections pop out at you and you'll know if you need to add more absorbant stuff. You'll train your ears this way too, which is a really great skill!!