Something you should consider is how attached you are to where you live. Automotive mechs can usually find a new job within a few miles of their last one. In aviation, career progressions usually require relocation and that could mean hundreds of miles. If you're single and don't have a mortgage that's great. Wives/partners/children don't like upheaval and I can speak from experience, especially if it means the wife/partner has a job.
And as mentioned above, the salary in General Aviation isn't that high. Even for licenced engineers it's not uncommon to be 40% less than for those on bizjets and airlines.
Unfortunately there aren't many opportunities around for anyone in aviation right now due to Covid. Good luck, though.