Great Analytic Tools for Substack?

I've been writing on Substack for 2 months about now and started to realize that analytics doesn't tell me much I need to know.

Like for instant, I can't really tell why people read what I write and there's no Substack native way to get feedback other than subscriber chats.

Is anyone using tools to do this? Need like a seemless way for me to understand my readers quicker.