20 years experience in the trades, want to get a degree

As title says I’ve spent 15 years in the field as a plumber/pipe fitter and another 5 years doing design work in revit and autocad. I’ve been a foreman/GF and a BIM lead but I’m honestly getting tired of the contract side of things and I really just want something with more job security. I’m tired of having to start over every few years because the company I’m working for gets slow.

Guess my question is how’s the job security on the engineering side of things and what kind of money can I get seeing as how I have 20 years experience in this trade? I even have experience with engineers doing design assist work and I’ve done plenty of sizing and load calcs. Right now a good year for me is around 120k, but then there’s bad years where I’m making 60-80 or less.