You should publish on your own blog, and syndicate to other places (Medium, substack, hackernoon, etc).

This is better than:

a) Publishing only on your own blog

b) Publishing only on the most popular site.

After all, your goal is to spread your message as far as possible. Single-site publications don't make sense in that context.

Negative, either that url or incognito for me.

hmm, that's strange - it's a special "friend" url and I can access it myself from an incognito window using this url (I have a Medium banner to subscribe but I can close it).