I think that's a natural sentiment to have right now as the meta is currently in a state of confusion just after rotation. A lot of people are hunting for a deck to settle on. The best general advice I can give is to watch a lot of matches on youtube and try to find a deck that you really like.
If you want my honest opinion, Zoroark GX is simply being hyped up as a supporter Pokemon because of its synergy with Mallow making it better than Octillery, but it is also unbelievable as a primary attacker. People are also neglecting the fact that you can put Octillery and Zoroark GX in the same deck. While I would no longer run Zoroark BREAK, the Mind Jack Zoroark is lethal in a format where people are starting to put 2 Brigette in all of their set up decks.
To put it simply, there is no other attacker in the game right now who can swing for 120 damage, 150 choice banded, by simply attaching 1 energy card. The speed and consistency of Zoroark GX is something people should be afraid of. Zoroark GX can 2 hit KO everything that will ever exist with a single evolution and a single DCE (and sometimes requiring choice band, i.e. Gardevoir GX due to resistance).
I want to make a Zoroark GX centric deck, and here is currently my skeleton for using it as the primary attacker:
Pokemon x 20
Zoroark GX x3
Zoroark x2
Zorua x4
Tapu Koko x3
Octillery x2
Remoraid x2
Tapu Lele GX x3
Kartana GX x1
Supporter x15
Sycamore x3
N x4
Guzma x3
Mallow x2
Acerola x2
Brigette x1
Item x17
Ultra Ball x4
Choice Band x4
Float Stone x2
Field Blower x3
Energy Loto x2
Rescue Stretcher x1
Special Charge x1
Energy x8
DCE x4
Rainbow Energy x4
Your primary starter here is Tapu Koko, so you want 3 of it. You want to open Koko and open DCE, flying flip spam while you gauge your opponent, then watch the state of the game as you build up your Zoroark to attack.
You don't need all 4 Sycamore in a deck like this because you're running both Octillery and Zoroark GX draw power. Play out your hand, Abyssal Hand, then use Exchange to extend your draws. If you play 4 Sycamore in a deck with this much raw draw power, you are going to deck out.
Because you are fully reliant on abilities, you want to play 3 Field Blower. Being a bit item heavy in this deck is also okay because you resist Psychic. Hurray!
Rainbow Energy, Zoroark GX, Kartana GX, and Acerola make a happy little combo. You want some form of Darkness energy in this deck because you want access to your GX attack at some point in the game (maybe). Rainbow Energy can satisfy that, and running Acerola means that you can scoop up your damaged Zoroark GX after you GX attack and drop it back down on the board again. You will have DCE attackers in the front lines while you charge up a Rainbow Energy Zoroark GX in the back lines. Beware of Guzma OHKO threats.
Kartana GX is here as a single Rainbow Energy guaranteed 1 prize GX attack if your Zoroark GX's GX attack is looking unrealistic. With a deck as fast as Zoroark GX, you're likely going to be knocking out a basic pokemon early in the game and playing the "7 prize game." Not anymore with Kartana GX.
Acerola scoops up all of your Rainbow Energy targets. If you stick 2 on a Zoroark GX, use the GX attack, scoop it up, place it back down on a benched Zorua, stick on a DCE and continue being a menace.
Energy Loto is in here because it lets you grab any energy, and you really only need to attach once per turn, but you really want to make sure you have at least 2 Pokemon ready to attack at any given time so you want to make sure you always have energy in hand. Energy Loto is for the early game when you don't crack open a DCE in your opening hand, but once you have a single Zoroark GX set up, you can just Mallow for the rest of them. Only 8 energy cards is a bit scary, so you want a method to be able to dig for energy. This is the only option for something like this.
Rescue Stretcher and Special Charge because you're going to get knocked out, and you're going to lose DCEs to the discard from your Kokos and your non-GX Zoroark. You need special charge to keep you in the game, and you can special charge then play Mallow to keep that alive. You might also end up having to discard things through Zoroark GX's ability and Sycamore.
This is a pretty out-there deck idea, but do I think it could work? Yes I do. You have the most consistent draw power, the most consistent damage, and the most options for searching, recovering, and closing games with Kartana GX.
I'll probably test this build myself once Shining Legends releases and proxy the Kartana for a while.