How to store 500+ manga at home? Seeking advice from the experts

I only realized while moving house that I have over 500 manga volumes... The room in my new place is much smaller, and there's absolutely no space for them.<br><br>Current options I'm considering:<br>1. Buy bookshelves (but I'm out of wall space)<br>2. Use storage bins under the bed (worried about humidity/dampness)<br>3. Rent a mini-storage unit ($500-800/month)<br>4. Sell a portion of them (I can't bear to do it)<br>5. Switch to digital versions (but I've already bought the physical copies...)<br><br>Does anyone have experience storing over 500 books? Please share your solutions!