Sarah Kendzior and Andrea Chalupa put together an extensive list of resources including for the census, voter registration, voter protection organizations and then lists links to get involved in key Senate and House races.

https://www.gaslitnationpod.com/2020-survival-guide


Crush2020 generates a "plan" based on factors you input including things like how much money you can donate, ways you're able to volunteer (writing, hosting events, call/texting) as well as location and where you'd like to be involved (in addition/instead of your home state):

https://www.crush2020.org/

Everydistrict is focused on flipping 11 states via local and state elections. There are opportunities to donate (they select 10 candidates every week most in need of donations and donations are split amongst those 10), volunteer for phone/text banks and canvassing as well as get info on key races

https://everydistrict.us/