Ask IH: Where to go to find customers?

I posted this earlier: https://www.indiehackers.com/forum/show-ih-do-you-need-machine-learning-work-done-60f4074cb5

And wanted to follow up. Talking to customers for consultancy work is something I have never done before and quite different from the B2C stuff I did before. Where do you go to find businesses that need Machine Learning work done? Where do you find your consultancy customers?