If you like MMO games with good singleplayer gameplay you can’t miss with ESO. Base game covers a lot. The expansion packs will be even more.
And unlike a lot of MMO games. No monthly charges necessary but possible. If you decide to sub to ESO+ you get access to expansion stuff except the lastest one and you won’t get access to the classes that got introduced in the expansions.
But… you’ll only need to buy the lastest expansion collection set to get all of that. The upgrade pack is only for people who got the previous expansions already.