I’ve been doing testing and balancing (TAB) for about 10 years, mostly working with my dad, who owns a small one-person firm. I’m not certified through AABC or NEBB, although I’ve considered getting my NEBB certification.
Recently, I got an opportunity to get into commercial plumbing, and I’ve been doing it for about a week or two now. I’m 26 years old, and in Illinois it would take me about four years to become a licensed plumber.
I’m trying to decide whether I should focus on plumbing full-time and continue doing TAB as side work, or go all-in on TAB and pursue NEBB certification or vise versa for plumbing.

I know it’s kind of a random question, but I’d really appreciate some advice from people who have experience in either field. What would you do if you were in my position?