How to increase author bio authority after YMYL algo update

I've just started to work on some health niche websites in the uk and I know since Google's health/medic update mid 2018, especially the E.A.T or expertise authority, trust criteria are a big thing now

I know that the author bio is a must these days if a good niche authority author, but what's the best way to increase author niche relevant authority? What is the best way to get this across to search engines on the page?

Marie Haynes is one of the best when it comes to algorithm updates (especially E-A-T). Check out her article below and browse her blog for more.

https://mariehaynes.com/eat/

Thanks @Holzr . Will do.

I think she also did 2 videos on her channel about EAT.