I applaud you for this. I have also quit the boost program because it has harmed the Medium community, and I say that as someone who had 27 stories boosted from Aug 2023 to Apr 2024. I benefited, but most people were disadvantaged by it. Good writers are getting harmed by the current state of affairs on Medium.

https://medium.com/all-about-m/the-nonboost-penalty-bd798ee83d69