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You don't need to create many category on same topics.  Google is very smart and know very well about customer need.

Google has been already read your page.

Can you share with the scree shot?

I think you need to show some examples.

Yes, you can.

Are you talking about this type page - https://www.xyz.com/search/?q=jacquemus

If yes, please do like this -

1- Add robots tag on these type pages - 
2- update robots.txt file - Disallow: /search OR /search/*
3- add new parameter in GSC as no URLs.

Can you show me any example?

You are facing problem due to redirection rule. You are saying you are redirecting as 301 but actually status code is 302. So you need to solve this issue first. http://prntscr.com/q9fbah

You can ask from Google ads directly, if you think so.

Yes, Frequently changed title is not good for Customer and Crawler. As it will result in conflict of interest as cumstomer may see 25% and when it lands on your page it says 10% which is wrong and might you end up with high bounce rate.

You need to hire someone.

According me, You should not use exact or range as discount in title. You can use discount related keyword in title like this -

Buy Zula Deste at Discounted Price | Cheapest Prices | gamesatış
OR
Buy Zula Deste with High Discount | Cheapest Prices | gamesatış
OR
Buy Zula Deste | High Discount | Best Price | Gamesatış
OR
What ever you like.

and You can write exact discount here - Check image

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So you are talking about this type page - https://www.gamesatis.com/zula-desteler which has this title - Buy Zula Deste% 25 Discount | Cheapest Prices | gamesatış. Right?

No, it is not hurt. You can use in title. But you should not use canada in url. That is not good practice due to you have already .ca domain.

Can you share with me your product page?

I think you should use range in title rather than exact number.

No, You can use this in Title rather than in url.