On this week's "Clinical Update with Dr. Daniel Griffin" on This Week in Virology podcast, they discussed a preprint of a study regarding the effectiveness of the bivalent vaccine. Basically, it is no longer very effective, possibly because of differences with the current strain (XBB.1.5). I had a bivalent booster in early October, but got Covid later that very same day, about 8 hours later testing positive. I will not attempt to get another bivalent booster at this time, based on this study.
This is one study, but it was the first one that suggested that more doses may not be protective. I still mask in crowded places.
https://www.medrxiv.org/content/10.1101/2022.12.17.22283625v5.full.pdf