What boosters should a Pfizer vaccine recipient get?

Link to the study: https://www.medrxiv.org/content/10.1101/2021.10.10.21264827v2.full.pdf

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The mix-or-match study found that people who originally got the Pfizer vaccine and received a Moderna booster had antibody levels increase 32 times the amount recorded just before the booster. Those who received a Pfizer booster saw antibody levels multiplied by 20, and those who got a J&J booster had antibody levels rise 13 times their previous levels.