Being out of the 'industry' for 2 years is not something I'd spend any energy worrying about. I've been in the indusry since the mid 70's. Some of the rules have changed but the basics remain the same.
Always look ahead with a goal in mind. Without a goal, you'll wander though your career.
Earn an associate degree from a local junoir college by taking evening classes and working during the day. I did it that way (of course we spent the first couple of weeks in math on slide-rule techniques... The pre-calculator era really sucked!)
You can take a curriculum of pre-engineering or controls engineering, or something along that line. You'll be surprised what you can pick up from classes like those.
Whatever you do, keep it moving forward, never sit and dwell on could-havs, or should-havs.
I suggest you read 'Who Moved My Cheese', it will change your life.
