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@Sam-1983

I did all the checks, it doesn't reach 100% but between 82-96% at technical and content.
Social media still working on it, with some ads, backlinks are around 100k, with good DA and PA and growing.

I have another suspicion...
I sell consumables for printers.
Until now, the products were individual.
In January, i made a change to the products and grouped them by printer models. Example: All products for Konica Minolta Bizhub C224 are in this url wich is created by tag (tag is printer model).
They contain both toner cartridges and developer or drum units (which are also individual products, of course).
All individual products have decreased by position in google searches.
Shall I canonically set these tags that contain all the products? Or what ?

@YarNik
I have same problem with my site, also in printing business www.sertit.ro
Lot of bad backlinks from domains with .xyz

For few weeks ago my website is constantly decreasing in search position. I lost keywords and is gooooing down.
Although it is well rated on several on page and off page seo verification software that I have tried.
I checked Google search console and Analytics and found no major problems. However… from one day to another it keeps going down.
I also checked what the main competitors are doing and they are not doing well, at all.
The main competitor actually has a creepy website. Totally devoid of onpage or offpage SEO but with an enormous number of backlinks. And of a very bad quality, which should disqualify it, still…
Few weeks ago I changed something.
In the pages I had H1, 4xH2, no H3 and an H4 without content.
An unnatural H tag structure.
Now I have H1, H2, H3, 3xH4, with the coherent information.
Theoretically, Google should have been “happy” or I’m missing something.

I use a SAAS platform.
I just found out that they made changes to the keywords (tags).
I am selling toner cartridges for printers.
So…
The tags are printer models and generate a url in which they have the products.
Ex. https://www.sertit.ro/cartus-imprimanta-cilindru-color-hp-laserjet-pro-m-177fw goes to the products for that printer model.
The question is… should I make tag canonical?
Is it possible for products to loose so much in Google search?