it hasnt changed as much as might seem. yes, gear changes, materials change but it still follows the basics.
the main difference between today and the time you last played could be the introduction of magical and physical.
the old crit and/or power cap are kind of a basic now, on which you can build magic/physical stats.
gear rolls are still ( or again) a thing. just has more options in more gear, and need different(ly named) materials.
reaching 65 gets you a free second best in game gear. however keep in mind this gear is full crit. from the innerwear to the jewelry. that might lead to a crit factor level your class doesnt need that much of. power based jewelry (can ) drop in some dungeons or are available in trade broker.
another newly introduced item are partners, basically a pet with different options (increase power/crit/magic/phys).
fishing is new, but not hard to understand and mainly important as either a base for buff food crafting ( dismantling fish into filets) or a small amount of extra income by selling the fish for gold.
cards also help to boost your stats. they drop from those that gave them their cardname, broker, and an option to fuse them 4 into an rng 1, as it was with crystals.
speaking of which, the new gear does not have crystal slots for crux/niveot/dyad, with the exception of accessories ( ear-/rings).
enhancement points are yet another stat booster. ep-xp can be earned from some quests.
apex skills give you 3 extra big skills.
hope i covered all changes.
the gear and the rolls just changed name but the basis is still the same as in mwa times, including the rerolling and keeping stats.
that leaves us with 3 changes that all boost your skill/damage/stats. (cards, EP points, apex)
in the meantime however there may have been changes to your class. another change since nexus days is that up-to-date guides moved from online to discord.
suggest you seek advice there for spending your EP-points, glyphs or changes to your rotation. if you do go look online ( like essential mana) make sure it is still up to date.
edit: how could i forgot inflation? prices (gold) have risen. upgrading attempts cost gold as well as materials. tt is sold for 1;4- or even 5000. check broker's last pages for an idea of today's prices.