The same thing happened to Examine.com, a great resource with unbiased reviews on all sorts of supplements.
Link to their Examine's article on being removed from search results: https://examine.com/nutrition/google-update-july-2019/
One benefit is having leading authorities in the space like Dale Bredeson guiding people to the site. It's probably worth building out a mailing list so you can stay "front and center" with those who are interested in keeping on top of the latest topics. Email marketing is one space where you can control the relationship as far as not having your visibility come and go based on the latest algorithm tweak.
Just my $0.02 as a very casual contributor who enjoys the resource you have put together.