One challenge is that my free and paid tiers for the newsletter are subtly different offerings. The free tier firmly within the territory of being a newsletter. But the paid tier is much more interactive, including community engagement, and a much stronger educational component. So I realised that as well as landing pages for subscribers, I needed a more complete landing page for those wanting to sign up for more serious study.
So here's my new landing page. It still needs some tweaks, but it sets out what the offering is right at the outset.