Congratulations!
Before you do anything else, I advocate boosting your credit score as quickly as possible.
A. My advice would be to find a lower rent situation (even a house-sitting gig that might get you a barter for occupying and maintaining a property for free or reduced rent). Then, put any money you save monthly toward reducing your debt.
B. I strongly suggest having an in-person meeting with your banker or credit union branch manager about your goals and your current situation. And, visit another credit union or bank, where you don't do business yet, to have the same conversation and ask the same questions:
1. Given my history and current situation, what tips or tricks do you recommend to raise my credit score?
2. What services do you provide to entrepreneurs and investors? And how do you stand out from the competition?
3. How can I benefit as a real estate investor if I bring (or keep) my business at your institution?
C. Shop aggressively for lower credit card rates and then go back to your credit card company and tell them what you found. Say that you want to move your business to another card unless they can match or improve upon the competition.
D. Have a chat with your current landlords, before you leave them, and see if they, at least, have any supportive advice for you, and at most, if they would consider an extension to your lease.
I wish you the best!