I have been forwarding my email to 5 friends every week and that gets a few subscribers. Honestly it can take two forwards before a friend sees enough value to subscribe.
And that's ok!
I also post it to LinkedIn every week, which gets traffic slowly, over time. Most my posts get 50 - 150 views on LinkedIn.
Posting on Facebook has not worked very well, and it is hard to see how many views it gets.
Sharing on Instagram has very few conversions as well. But I keep posting, and maybe eventually more friends will sign up.