If you have a 3D printer and would like to help, head to https://www.3dcrowd.uk/ where you can sign up as a volunteer. There's information about what to print, what materials to use, and what process to follow to make sure the PPE you print is safe to use. If you're not in the UK, there's probably a group local to you. There's a list of major ones on the Prusa blog at https://www.prusa3d.com/covid19/, but also keep an eye on the usual maker channels.
If you don't have a 3D printer, but would still like to help, there's a crowd-funding campaign at https://www.gofundme.com/f/3dcrowd-emergency-3d-printed-face-shields to help buy the necessary materials to keep making masks for as long as they're needed.
Overcoming this virus will take a massive global effort, but like all massive efforts, it's comprised of lots of little things. If we all do what we can to keep each other safe, then we'll be in a much strong position when we come out the other side.