Those people who would have been traditional Labour supporters, but are unable to support Starmer, are any of you Labour Party members?
Surely the best way to protest would be by doing it from inside the party as opposed to protesting by not voting at all and allowing the chance of a truly racist party to remain in power?
If you can make a feasible vote for a different party, go for it, if you have to hold your nose and vote for Labour, do that, but please, please, please vote against the Tories somehow.