I made a few sales. How to start analyzing what source converts and is marketing worthy?

Hi.I launched a few side projects, and recently started making first sales. I was using Google Analytics for analytics, Clarity for Heatmaps, and LemonSqueezy for payments.

I saw people using tools like PostHog, but I'm not sure it fits my needs, didn't see integration with LemonSqueezy.

I'm missing analytics to track what source are users who converted into Pro plans coming from. I managed to see some data from GA + Clarity, but it isn't clear enough with charts easy to view :/

What's your recommendation in this case? e.g. I'd like to know this paid user came from Reddit and Reddit is worth creating content & marketing for this business.