That sounds like a really frustrating situation to be in, I'm sorry to hear that your SFH has been damaged by a squatting tenant. As someone who has experience with property management, I can understand how overwhelming it can feel to deal with such a mess.
Regarding your question, I think there are a few things to consider. Firstly, repairing the house out of pocket and selling it might be a good option if you're looking to upgrade to a nicer neighborhood. However, if you need the money back relatively soon, that might not be the most feasible option as repairing the damage will likely take some time.
On the other hand, using financing to repair the house and renting it out at a higher price could be a good long-term investment. You could consider taking out a loan or using a home equity line of credit to cover the repairs. It's important to research your options and find a financing option that works best for you.
Alternatively, you could choose to sell the property as is, but keep in mind that you may not get the same return on investment if the property is not in livable condition.
Ultimately, it's important to weigh your options and consider your financial goals. If you have some money saved up for capital expenditures, that's a good start, but you'll also need to factor in the cost of repairs and any financing options you choose.
I hope this helps, and best of luck with whatever decision you make. It's definitely frustrating to have someone destroy your property like that, but I'm sure you'll figure out the best course of action for your situation.