3 or 4 way switch/dimmer woes.

Hello,
I preface this by saying I am NOT an electrician, just a DIYer lol. The power is OFF

TLDR: Can't get a dimmer to work because I am a N00b.
So I have a circuit for one lamp to which I want to add a dimmer (5 wire wifi enabled). The circuit is set up as follows.

There are 3 switches. Two 3-wire, and One 4-wire(4 way as I understand). The box I am working in is one of the 3 wire verities. To complicate things, the box in which I am working also has a switch which I presume once operated a ceiling fan (it is a 2 wire and does nothing) and it is wired into the whole thing.

So what I am left with is the box, which has FOUR bundles of romex (Two 2-wire and two 3-wire) coming in. There is a wire nut tying together most of the white(neutral) and an unused ground. I removed the 3 wires from the old switch as instructed, and connected them to the dimmer (ground, neutral from the bundle, Load, and TWO "travelers" <---this I think is my problem) Nothing. The dimmer LED doesn't light, and neither does the fixture.

I know this is probably confusing and a long shot. I also know it will probably end in having to call a professional lol.

Thanks for any help. I can answer questions, or send pictures if need be.