If you've ever liked Nintendo games, Switch is a must-buy.
Zelda games would probably be the games for you to get next, unless you have no interest.
I would've said you should've waited for the next system, but we don't know yet when for sure it will come out. We also don't know the price or the availability. Switch was easier to get from March 2017-March 2018 than Wii, PS5, and Xbox Series were in their first year. But that doesn't mean it was easy to get one. Anecdotally speaking, my local retailers would usually only get a single Switch at a time after the initial launch up until Super Mario Odyssey around Halloween.
Lifetime Sales Predictions
Switch: 161 million (was 73 million, then 96 million, then 113 million, then 125 million, then 144 million, then 151 million, then 156 million)
PS5: 115 million (was 105 million) Xbox Series S/X: 48 million (was 60 million, then 67 million, then 57 million)
PS4: 120 mil (was 100 then 130 million, then 122 million) Xbox One: 51 mil (was 50 then 55 mil)
3DS: 75.5 mil (was 73, then 77 million)
"Let go your earthly tether, enter the void, empty and become wind." - Guru Laghima