For good (hopefully)
Roman I think realistically all of you content creators that are looking to earn a living behind paywalls is not going to work. I barely ready your newsletters, or even view stuff on Patreon. I currently totally fall into the TLDR or too busy category, so its just information overload and noise.
So I think if you add the paywall, you will simply find the same results as the various mainstream media type platforms that hide their articles behind paywalls that you and other creators often tease. You will eventually be E-begging via discounted memberships, while your readership dwindles...