I honestly can't remember about the gear and I have not used either 80 boost from HoT or PoF yet. They are clogging a shared inventory slot. I don't think you need to use the 80 booster to get the gear, but someone might have a better memory. I can't remember about the armor because most of my toons were already in exotic and one was in partial ascended when PoF came out.
Jeweler and Chef are still a max of 400. All of the others have a max of 500 since they added the ascended gear. I'm still working on leveling up my crafting, putting ascended gear on a second toon, and crazily started working on a legendary that I have the precursor done for, but now I need tons of materials. Most of what I figured out for crafting I did through the wiki or googling for other player created sources.
Like you, when I came back last summer I had to figure out what I was doing. I did get HoT in 2016, but found it didn't grab me at the time. I'm a lot happier with the game now and loved PoF. I still have a lot to work on in HoT since I don't have all the Masteries done there yet.
My suggestions since you have everything now:
HoT - definitely work on the gliding, you will want bouncy mushrooms next for map exploration because even if you get the PoF springer mount, you may still need the mushrooms. At some point you will want to work up to the poison related skill which without logging on I can't remember where that one is. There are spots where you will not survive without it. Not a lot, but they are there and I think one has a mastery hiding in it that you will have to wait for because you'll die before you can get it.
PoF - do the starter story that gets you going and gives you a mount as soon as you can for the fun of running around faster on the maps and jumping horizontally over all sorts of holes in the ground.
The most important thing is to have fun. If you see me one and need some help, don't hesitate to ask. If I'm not already doing something with others or in a story instance for one of my toons, I will gladly come.