How did you get your first 100 users for your SaaS?

I’m building a SaaS and I’m curious how other founders got their first users.
What was the thing that actually worked for you?
Cold DMs?
Reddit?
Content marketing?
SEO?
Paid ads?
Partnerships?
Existing audience?
I’d love to hear real stories, especially what you did when you had no audience, no brand, and a very small budget.
How many users did you get from it, and would you do the same thing again today?
Thanks in advance. I’m trying to learn from founders who have already gone through the early-stage grind.

Author: Dear-Sail-252