I have hit 10K to 20K+ months intermittently throughout my business journey multiple times. First time was in year 2. It hasn't been consistent at all but the first time it was consistent started in the last few years. Great question on Medium vs Substack. That's tough. Medium has a bigger audience but, if you're active on social, you can blow up your Substack email list if you're talking about it a lot. Especially if it's a free newsletter. I'm growing a second Medium account now and the growth is very slow. I would do both, honestly.