I haven't played in several years and I do not know what to do after hitting max level.

Could someone give me a breakdown of the max level activities?

I'm used to logging in and doing 20+ daily quests. There are many different systems in the game now and a lot of things I do not understand. For example, I don't know what gear is worth upgrading or not.

There are many different "currencies". I don't know what I should be saving for or spending on.

I don't know how professions work anymore of requisitions.

I am finding myself to be overwhelmed and trouble finding my barrings.