Outside of voting, you have options. I'm not American, but I'd advise any communists to vote Biden simply because the repression under Trump could get really ugly, hindering any proper organisation. Just view it as what I think it also actually is: A cynical, pragmatic move to save you and other working people from more open repression, nothing more.

But before and after voting: Put your energy into unions like the IWW, into neighbourhood organisations for mutual aid, into community defense like the SRA or Redneck Revolt, into antifascist organisation, into refining your own position and presenting it to others. Create networks and connections. All preventing Trump is doing is buying time for now to do exactly that. Things will only get worse in the decades ahead, with no end in sight for the climate catastrophe and further decay of capitalism - and laying the groundwork of actually being able to do something is critically important right now, in my opinion.

Of course everyone is in the end their own master when it comes to decisions like this. Just - remember that by not voting in this specific election you also aren't changing anything. And while I fully understand the desire to organise for a third party, they have been marginalised effectively, at least I personally don't think electoral politics will bring any relevant changes, one way or the other. They are just about who carries the whip used against you, and in this case if the are openly and harshly, or covertly and less efficiently using it.

That all being said - I think a few people here overestimate the amount of tankies and communists that won't vote Biden. The group is marginal in the big scheme of things. If Biden loses, you can be certain, they were not responsible, they are most likely less than 1% of voters. Personally, I'd blame the corporate core of the Democratic party and middle class liberals for being out of touch with reality.