You might be able to do your masters degree directly based on experience. If it's expensive in the US, you can try other countries with recognised degrees. Might be a great 1-2 years global travel experience as well. 

Another option is to explore a consulting niche in cooling solutions for bitcoin miners. Reach out to experienced miners like Derek or Daniel to understand the challenges miners face. This knowledge can help you create effective solutions. You can try by serving 1-2 real customers, crafting solutions to their cooling problems. Set up simple ways to book your services online, and gather reviews. As you get sharper, you can create your own specialization  "bitcoin mining cooling doctor."

Another option is to work within the hvac industry - find big players and apply for other roles within sales, marketing, customer support. You already come with hands-on experience so it would be a plus factor. Every experience will add up to your knowledge and skills.

The final bit is how you write your resume. You can say 6 years in hvac repair. Or you can elaborate - worked with 200 F&B businesses on industrial repairs, including both hardware and software components (X, Y, Z). This approach helps potential employers quickly grasp the extent and diversity of your experience. Tailoring your resume to highlight relevant details can make a significant impact, based on what would attract the person you engage. 

Setbacks sometimes can be an opportunity for something greater, one you may not have tried, if life was the same day in day out. 

You got this.