The number of internal links isn't as important as the relevancy of all those internal pages.

8 internal links is ok. No need to reduce it.

Relevant links below your post should be 2-3 that would be good. Highlighed word with internal link would be good seo boost

8 internal links is no big deal. I have some pages with 30+ relevant internal links.

Look at a typical Wikipedia page, they have 10's/100's of internal links per page.

In website internal links which link from one page to another page on the same domain of website.
But there are different reason. Some link are generated in hierarchy form where all page are connected together in inherited form.

Internal links are the links from target domain to the domain that exist or the source. It have the credibility to rank the website. In simple links within a website are known as internal links. It is very much useful for establishing site architecture and spreading link juice.

No need to reduce links get authority links to your website for better ranking on Google