Restart WoW more than a decade later

Hello,

Sorry if this question has already been answered...

I've been playing WoW during BC and Wotlk, I've played a lot, mainly in Raids. Few weeks after Cataclysm release, I quited the game.

It's been more than 10 years since and I want to play WoW again but as a casual. I can only play 2-3 hours on Saturday and Sunday.

I saw that there are a lot of evolutions and differences. My shaman is now level 33. So my question is : is it better to restart a new shaman to learn new mechanics ? Or can I play my old champ easily ?

Thank you for reading !