I took the SI advice of getting into therapy and figuring out who I was before I started dating. I waited a year to date, and that was probably too soon, the first relationship wasn't the healthiest. I did end it, but not after falling hard for the wrong guy.
BUT, that relationship also sharpened what I am looking for. After that, I have been a much better dater.
Start volunteering, cultivate good friendships, focus on yourself. The past is done and you can only look forward. Just keep yourself busy so the downtime isn't as painful. Join MeetUp groups in your area.
If I have a down weekend without plans (pretty rare these days…), then I make a date with myself and rent a movie I've been wanting to see, and order out my favorite food and just enjoy my life.
Dating because you are lonely isn't the answer. Create yourself a good life so that you attract a good partner. That is much more the answer.