Have you thought about getting your CCM? I would recommend starting to attend the CMAA meetings in your area and doing some networking in order to get a job. People are a lot more likely to hire someone they have met, especially if you can find someone to mentor you for you CCM (I think that it is a requirement for other who have their CCM to mentor) I am in that industry. I was on the PM/CM side for several years and was able to get away with a pretty decent work-life balance of 7-4. (Unfortunately I have completely lost that balance by working overseas but that is a different story and as a side note a great way to get FIRE faster). Anyways, find companies that do PM/CM work, stay away from working directly for contractors, and consider working towards a degree. If you find the right company they may even provide some tuition reimbursement. You said you were an engineering intern previously? If so, if that's not what you're interested in, then maybe a CM degree - you could do it online.
Good luck, sounds like for 24 without a degree you are doing well for yourself, you should be proud of yourself. I would be patient with the job hunt, three weeks isn't a long time, and it sounds like you have had some good responses. Take the time to find the right job, not just another job. Sometimes the grass isn't always greener on the other side....good luck!