Well, in my opinion and experience, internal linking may be google ranking factor.
So, too many internal linking to low quality pages from top ranking pages somewhat may harm google ranking. The number of links may be different upon the scale of sites.
How many pages does your site have?
Once again I find myself repeating the same words "No one knows how the Google Algo actually works" but after that being said... I don't think internal linking will affect the rankings that much. Just don't go overboard with the internal linking and try to link to pages that also have a chance to rank better. i.e. don't do internal linking to low ...
As of September 10, 2019, Google announced to start treating rel=nofollow as 'hint' which means in some cases it may decide to count it or may also use it as an advantage to rank some sites. Read more here.