You don't have to do shit that gets on national news to make a difference. Just being brave enough to go outside is the only requirement to help. Part of the reason Greta and others did this is so YOU take action how you can as well.

You don't have to be brave beyond going outside if you can't be. You can come join us at the next protest, vigil, sit-in, or even just learn more on a virtual meetup.

There are countless organizations but if you're in the US the easiest way to find out about events in general will be find your local PSL or DSA on Instagram (yeah I hate Instagram too but it is what it is). They aren't always the groups organizing activism but, in general, they will be promoting the events and that can help you find more specific groups in your area.

Outside of the US I can't be as helpful though.