I can give a perspective.

I have had 4 shots: 3 Pfizer and 1 bivalent. I have also had a bout of COVID (Omicron, I suspect) with very mild symptoms. The shots and boosters were recommended by my government (Singapore) and free, so I took them. Just a reference: Singapore has a full vaccination rate of over 90%.

The last shot (the bivalent) took me out for a day. Arm felt bruised, slight fever. Got better in a couple days. But basically I do wonder how much my immunity could have waned when my body reacts so strongly even to another dose of the vaccine. Each dose the reaction generally gets stronger, which I suppose is good if I get exposed to COVID again, but I feel like maybe I can afford to space out boosters more.