At this juncture, election protection efforts are as critical as GOTV and reaching voters. For example:
https://allvotingislocal.org/
Efforts focused in Arizona, Florida, Georgia, Michigan, Nevada, Ohio, Pennsylvania, Wisconsin
A couple other election protection orgs here: https://www.democraticunderground.com/?com=view_post&forum=1002&pid=19325356
And the mobilize.us site is a bit of a one stop shop to search for various types of people-power driven activities. The drop-down of organizations is a good place to scan for a variety of groups (warning: very long). Activities are generally election focused now, but many of these organizations spearhead other types of community organizing year round.
And https://citizensclimatelobby.org/ has local chapters across the country and provides great DIY materials for citizen lobbyists on climate change.
And of course, right now there are phone banks, letter writing, social media training, and other activities to be found on the Harris/Walz site. More on that here:
https://www.democraticunderground.com/100219320017