Let them know that you’re working as a freelance writer and list the topics that you cover or industries that you work in, and ask them to let you know if they have any contacts that might be in need of your services.
There are a number of jobs board that specialize in freelance writing, freelance work in general, or all types of remote jobs. These job boards can be a good place to start because you can quickly find opportunities.
If you want to avoid some of the competition that comes with applying to jobs listed on job boards, an excellent alternative is to proactively find opportunities.
Once you’ve found a few freelancers, you can do a little bit of research to find what sites they are writing for. Each site that has hired other freelancers is a possible target for pitching your own services.