How to make a redirect while keeping the old address?

Question

Search Engine Optimization

Situation. There is a roughly one-page site that has all the information about the product on the main page. Good traffic from the PS goes to the main one, respectively.
But now we are launching the second product, and accordingly it will have its own separate address / product2. And the first product is also transferred to a separate address / product1. The main page will now have a description of the company and a list of products. How it is competent to organize for PS? The fact is that if I put a redirect from the main page to the page of the first product
header('Location: /продукт1', true, 301);
then the main page will disappear. And now she has a different role and she should also be in work ... You need to somehow notify the PS that the main page is now at a different address (so that they change the page in the search results) and at the same time that the main page is now used for other purposes and should also be separately indexed and available to users?

Answer 1

Somehow it is not clear - a redirect is either done or not done.
Apparently, you don't need any redirect - just hang a big banner-link to the first product on your website and that's it.

Answer 2

No way, with such changes, it seems that losses in SEO cannot be avoided.

Answer 3

The weight of the page will fall in any case, as a result, organics will fall, but it seems to me that most of your requests are vital, as a result, it doesn’t matter what URL.
If so, then there is no problem at all.
In any case, the sequence of actions
is as follows
: 1. create a new page (duplicate)
2. Wait for the new page to be indexed
3. Make a 301 redirect (yes, part of the weight will be lost, but it will be so and so if movement within the same domain is still somehow possible level, but two different ones, these are two different
sites.In general, it’s an idiotic thing to do different domains, since it’s 10 times more expensive to promote 10 sites than 1.
If these are separate brands, then they have vital traffic and there’s generally no where to lead.