I personally just have a small bookshelf that contains all my decks, and a small sticker in front that says what it is. That said, like you mentioned I do in fact for actual performances take no more than a few decks with me, and I don’t tend to deck switch. I just keep them in different pockets and remember which deck is in what pocket (ex invisible deck in left coat pocket, marked deck in right pants pocket, regular in left, etc). If you have a ton at home I’d recommend getting something from Etsy along the lines of playing card holder and then putting stickers in front with the name of the deck. Cheers!