I run a newsletter for my startup called 'Media First Brand' where I write case studies on content marketing strategies followed by amazing creators and compani

I run a newsletter for my startup called 'Media First Brand' where I write case studies on content marketing strategies followed by amazing creators and companies. I have covered Slack, Harvard University, First Round Capital till now. I am not sure how and where do I promote this newsletter as such. Suggestions for growth hacks are welcome! This is my newsletter link to read and subscribe: mediafirstbrand.substack.com