Decoding SaaS Newsletter

I'm building a newsletter "Decoding SaaS" on SaaS strategies from building-in-public posts and it's at a very early stage (5 weeks since launch). Here's where my visitors came from

Substack -(30%) - this was a one time boost that I received at launch.. after that I didn't receive any new subs from substack

My own website microsaasdb (60%)- I'm happy that there is a steady visitor-to-subscriber conversion from my website which I'm actively promoting.

Twitter 10% of subs. I'm not super-active on twitter and have a small following of 90. However, I do post about SaaS once a day and the link to my newsletter is included in my profile (I have 2k+ profile visits a month)

PS: I hardly ever promote my newsletter directly as I'm still finetuning its messaging. In past I experimented with newsletters and I couldn't stick with a single communication style- so now I'm focusing on building the content site (to know who my audience is) and accordingly plan my newsletter content.