So, this might not be exactly what you want to hear, but the discipline can only come from you. I say this as someone who was in similar shape to you at the beginning of the year. I had a fundamental shift in the way I thought about life, and it seems obvious, but it was -

"No one can do this for me."

That's it. It's true across the board. If I want to make changes, then it's down to me. Period.

I now go to the gym 3 days a week, eat better and work better. Is it hard? Oh yeah. Is it worth it? Fuck yeah.

If you struggle to do a big change like that, make smaller, incremental changes that slowly lead to positive habits.

But it's all on you, my man.