I guess the important thing is that one should do other things in addition to voting for the bland somewhat shitty candidate that's at least better than the other guy.
Unionising and getting involved on the local level are two good starting points. Encouraging others to unionise and to get involved locally is also good.
Oh, and reading up on alternative election systems and teaching people about it would be good, but maybe too ambitious. Who wants to listen to anyone ramble on about ranked choice or whatever.