Yeah my biggest fear is that the short term solution is to sell everything, but then buying everything again will be super expensive

I'll move back to NYC when i'm done traveling, but that could be at least 5 months of pure backpacking! As for storage, think the prices here are fairly reasonable for New York?
https://www.boxie24.com/en-us/self-storage-bronx
i'm thinking it would be the 'Medium' option, as there are a lot of things :////
There are some things that are hard to replace, but some of it is IKEA or whatever. Decisions decisions