Half the battle is what would you like to do. It's like being at school and not sure which path to take after your exams. I was in that position when I left flying 12 years ago until someone suggested I carry on training in the form of teaching English as a foreign language which is what I do now. I worked for the British Council in the Middle East and working with many of the other teachers often reminded me of flying days because of the various characters. I lost count of the number of times I said "it's like old times" or "nothing changes". I also teach travel and tourism from an airline side. I still find that rewarding.
However teaching is not everybody's cup of tea. Coming from a job where your office is in the sky to one on the ground can be a drudge. Look what happened to Douglas Bader prior to WW2. He hated a desk job and couldn't wait to get back flying. Sales is hard because it's usually commisson only. Perhaps working at an airport near you might be the answer. If you still need aviation in your blood then check out ground staff positions.
Good luck!