yeah i took mine on vacation even and never turned it on. there are games i wanna play, like finishing dk bananza and starting xenoblade 2 but i finally hit that age where i'd almost rather do anything else than play a video game. so weird to say that
There are some great Pokemon games and Z-A isn't one of them.
On Switch you've got a few options. Let's Go Pikachu is a remake of Gen 1, which would seem like a no-brainer on a good first Pokemon to play, but it has some really tedious game mechanics. Pokemon Legends Arceus is full of empty space and little respect for your time; most people love it, but as someone like you who needs some real motivation to even turn on a game, I don't recommend it.
That leaves Gen 8 (Sword/Shield) and Gen 9 (Scarlet/Violet). Gen 8 is more your traditional Pokemon RPG, go from town to town defeating gym leaders. Gen 9 is more of an "Elden Ring Pokemon", open world and has tons of objective markers to hit, with three different main storylines that can be progressed in any order and parallel to each other. Personally I loved Gen 9, but a lot of people didn't because it has framerate issues.
TLDR: Pokemon Sword is probably a good first one to run through and get the idea of whether you like the series or not. If you want to go back and play Gen 1 retro-style and try to capture the magic of someone else's nostalgia, run Pokemon FireRed (GBA, Switch Online might have it, or the eShop, and easy enough to emulate if they don't).
Personally I'm also in the boat where turning on a game has become more and more difficult as time goes by, and I frequently drop a project soon after starting it. Helps to plan things out. Like I've got Red Dead Redemption and Xenoblade 3 pencilled in as my "finish by the end of the year" games (+RDR2 if I have time, +Metroid Prime 4 if it actually launches) to give me some focus. I pretty much never replay anything besides Fromsoft games, either, everything else is a one and done these days.