It sounds like you and your boyfriend/business partner are in a strong financial position, with good credit scores, a significant amount of equity in your primary home, and a solid savings cushion. Based on the information you've provided, it seems like you have several options for moving forward, and it can be difficult to decide which one is the best fit for your goals and needs.
One potential starting point could be to focus on paying down your credit card debt. This can help to improve your debt-to-income (DTI) ratio and give you more flexibility to take on additional debt in the future. It can also free up more cash for other investments, such as long-term rentals (LTR), buy-rehab-rent-refinance-repeat (BRRRR), short-term rentals (STR), or flips.
Once you've made progress on paying down your credit card debt, you can start exploring the various investment strategies that you mentioned. For example, you could look for properties that would be suitable for LTR, BRRRR, or STR, and analyze the potential returns and risks of each option. You could also consider partnering with other investors to share the costs and risks of these investments, or to gain access to additional expertise and resources.
It's also important to consider your long-term goals and how your investment choices will support them. For instance, if you want to build a portfolio of rental properties, you may want to focus on strategies that will generate consistent cash flow and long-term appreciation, rather than short-term gains from flips. Alternatively, if you want to generate more immediate returns, you may want to focus on flipping properties and using the profits to fund your other investment activities.
Overall, the key is to carefully evaluate your options and make decisions that are aligned with your goals, risk tolerance, and financial resources. A financial advisor or other professional can also provide valuable guidance and support as you navigate this process.