I'm a huge fan of Project:Gorgon, I try not to recommend it too much but I have to mention it since you've said you used to play Runescape. The game's only slightly similiar but I've heard some Runescape players say it scratches the same itch. I'd classify it as a sort of mix between Runescape and a more usual MMORPG - you have a ton of skills that interact and build off of each other on one character, and you also have classes, builds and some group content.
Since you mentioned character expression - have you considered Path of exile? That game is well known for it's massive skill tree and build variety. Alternatively you could check out the Ascension private WoW server - it's based on being able to pick skills and passives from any class when you level up.
If you've enjoyed Albion, why not try EVE online too? Those two games are in a league of their own honestly, nothing else had got my hands shaking and heart pounding quite like sitting on my ass in the comfort of my home playing a spaceship game hahaha.
If you want something with nice graphics like Black Desert, that's going to be tough, generally newer MMOs on modern engines are few and far between. Maybe New World is your best bet.
Already mentioned my favourite in the last thread, so I'm gonna talk about the worst: Metin2. I played it back during it's peak years circa 2011 or so? Here in Czechia it was incredibly popular, as well as in some other EU countries - no surprise given that basically no MMOs bothered to offer translations to the local languages so it was almost entirely without competition.
I have two problems with the game - first, it was incredibly pay to win (obviously, being a korean title) and second, it's bland as can be - it didn't even try to differentiate itself from the other grindfest korean games out at the time. It has a place in the cultural zeitgeist now and a lot of people are nostalgic for it but I really don't see why, it's one of the few MMOs I barely remember playing since nothing about it stands out
The OST is a banger though, that's for sure.