It's difficult to give you ideas when I don't know you.
You have to ask yourself what your skills/qualities/interests are and perhaps go from there. If you've been working for yourself I think you'd probably find it hard to work for someone else. Also, there aren't that many jobs out there.
I have known people who have had a complete career change and made a success of it. One of my brothers is a policeman and many of his colleagues retired at early ages and went on to have completely different careers. One became a funeral director, one set up his own gardening business and one started selling bits and bobs on Ebay as a hobby and now makes a good living from it. Another one went on a short TEFL course (Teaching English as a Foreign Language) and makes a good salary from that.
My friends husband was made redundant from his job as office manager. He was a dab hand at DIY so he put leaflets through the doors of every B&B and nursing home in the area offering his services as a handyman. He is making a mint and loves the fact that no two days are the same.
If you do decide to have a go at something else, try it part time at first.
Good luck.