I have the same problem. I'm lucky enough that my network of former colleagues and existing clients has provided steady work. One example - a high level person at a startup I still work with, left for another position. I made sure to stay in touch with him, if only by connecting on LinkedIn. He gave me some project work when he started his new role. There is a lot of turnover in tech (assuming that's what you are doing) so staying in touch is essential.

Search out colleagues who you have worked with, even if you didn't work directly for them. If they know you they should be in your network. I have gotten referrals from colleagues I worked with 8-10 years ago, because I stay in touch and periodically say hi or comment on their posts. You can do all of this from your couch.

I'm a LinkedIn pro, which I don't think has any additional value other than being able to cold message people. Look for companies hiring for your niche segment and then see if you have any 2nd degree connections. If not use one of your 15 InMail credits. Try to connect and let them know that you are available in case they ever need freelancers/contractors. Most of the time this will yield nothing but it's worth trying if you have nothing else to do.