I'm getting a lot of "To boost or not to boost" questions, so here's a Table with some recommendations now that boosters will soon be available to all adults.
There are many uncertainties for waiting, and the original vaccine boost provides an extra layer of protection.

Would add hybrid immunity to the boost later column (i.e. 3 shots and a prior infection). Note this refers to a 4th shot, with a person beyond 4-6 months from 1st booster

Good editorial by @washingtonpost on 4th shot/2nd booster becoming available for age <50 and who might benefit now
www.washingtonpost.com/opinions/2022/07/13/booster-shot-confusion-get-them-now-or-wait-better/