You should for sure make a tamagotchi youtube channel! I've never actually seen one before or watched any tamagotchi related videos, but I would watch one ^_^
My number one tip would be to make videos you enjoy filming or are passionate about. I find that no matter the topic, you can really tell when someone is passionate or not, and it shows! But you genuinely love tamas so I don't think this would be an issue for you.
You could do unboxings, tamagotchi hauls, diy crafts, tips and tricks on how to care for the physical tama (like storage and care to make sure the electronics stay functional for a long time), keep things interesting by making a bunch of different videos. Play around and see what you like doing the best. Hope this was helpful!
(P.s., if you do end up making that channel send me the link I'd love to support you and subscribe!)