Will replacing the site index with a landing affect the position of the site?

Question

Web development

I have a 5 page joomla site. I plan to replace the Indian page with a landing page. Meta tags and title tag will be saved. I will leave the rest of the pages of the site so that the search engines do not panic. There will be no links from the landing page to other pages of the site. Before that, there was a menu. Tell me, will the site go down in the search results?

Answer 1

The issue will not change if:
1. The address of the main page remains the same
2. The landing page will not scare away visitors, that is, the number of bounces will not increase
2.1. The landing will be very cool and users will be delighted, which will increase the number of uniques.
Any improvements to the site are welcome. Something like this.