4 customers in first month after launch, good or bad?

Hey everyone, I recently spent three months building sifd.io - a platform that connects brands with creators on YouTube and Twitter for promoting products and services.

I spent three months building this thing, full time. Then hit I the launch button, blasted it over social media and got my first customer pretty quickly. I was stoked, but then, crickets.. I proceeded to grind, doing cold outreach, a few ads, etc. I managed to wrangle in three more customers as month 1 is nearing its end.

**Note **
By customers I'm referring to brands that pay to be on my platform. I've also acquired 16 creators. Also, these customers are paying $300/yr for my product (although I gave most of them discounts for being initial users).

In addition to this, I've had three brands sign up, fill out their profile, and then fail to subscribe. I've also had a few creators sign up and then fail to verify their email address (which squashes their ability to use my platform).

The thing is, I can't figure out if this is good or bad traction. I know most startups are a grind at the beginning, but I've also heard that when you find PMF, it hits you over the head like a ton of bricks, which has definitely not been the case for me.

My current plan is to keep working on it, but honestly, I don't know to whether to be happy or sad about my progress. I've seen startups get funding with fewer customers - not that I want to take funding - but perhaps I should be happy I got at least one customer?