I have a useless degree but now have some contruction field experience and seem to be getting rejected from every APM role I apply for. Advice on what kind of certications or anything I should do to be more marketable?

I have a useless degree and I'm 31 (hopefully not too old for a career change).

I have about one year of carpentry/labourer experience working on large hospital. This kind of work is actually alright (usually), but not something I want to do for long time. The other PMs here dont have CM degrees and some of them it's their first job so I figured it can't be too strict on the educations/experience requirements.

Current company said they would pay for my tuition to get further educated in something construction related. This was one year ago and I have yet to year anything concrete about it. Just "we'll get back to you" "let me talk to the CEO" "We are working on it", that kind of stuff. I told the current boss that you can keep my hourly wage the same just teach me something and "promote" me later. He hired his 18 year old nephew for the position instead. It is what it is I guess.

So, assuming that they don't actually get back to me and I have to get educated by myself, and considering I already have a degree, what kind of classes should I take? Is it recommended to get another degree in CM? I really just want to start learning about how it all works in real life.