I went with 2019 the last time. Welp.
I feel like 2021 has to be the peak year, with how well it's already been selling, plus the bonus of several big releases in the second half of the year as well as a new hardware revision. Everything seems to be pointing to a very successful holiday period. You'd really expect the other consoles to pick up the pace in 2022, but then again, with Splatoon 3 and BotW 2 coming out, who knows.
I'll go conservative and say 2021.