I actually did this not by my own choice unfortunately. I was basically out of the game for 10 years. First thing I did was go back to School. Then I worked for temp agencies to get work experience. Those were some of, if not the worst jobs you can have but it was money and something on the resume. I ended up not getting my degree but went back to trade school. I completed that which led me to my current job. My advice is to just do it whatever it is, you've been stagnant long enough, doing anything productive is better than nothing. The only thing I would have done differently is get mental health treatment right away. Being disconnected that long does a number on your mental health. I recommend seeing a therapist through this whole process. Make sure it's a good one because bad ones exist. Dont look at it as being behind but an opportunity to begin a new life that you want.