If you don’t vote for the centrist candidate, you can’t object to the right extremist.
Actually this does track that a lot of what I see online is people who seem unwilling to compromise: neither are what I want so both the same. You need to be willing to vote for the one closest to what you want, and work toward moving that leftward over time.
We had a huge success with “The Squad” getting enough attention before Biden’s first nomination to influence the party platform. As a minority voter, this path is more likely to succeed than not voting