I added opening_hours=Mo-Sa 08:00-18:00; Su 08:00-16:00 5 years ago, probably because there was a sign then. Today I couldn't find a sign, so SC added opening_hours:signed=no The opening hours are likely to still be correct so shouldn't be deleted.
There's another shop with almost the same name (so probably the same company) a bit to the east which still has a sign, with the same hours, so the opening hours are probably still correct.

Is this a new shop where there was no shop mapped before, or is this replacing a shop which was mapped already? If replacing an existing shop, please do not create a new node, but edit the node of the previous shop.
I already edited format mistakes in your entry: opening hours is without spaces before and after - and date ranges should be separated by ; (see opening_hours=*#Multiple_days_and_multiple_time_periods ), street names should be copied from the street way (usually a dropdown menu shows the names of the nearby streets) and phone numbers should start with +359

No, I didn't count the single step when counting the number of steps of the ways mapped as steps, so they are correct

OK, I added a step at the most NW one, within the asphalt part and not on the separation of asphalt and paving stones ;) Now it's perfect! (?)

Only 2 of the paths have such as step, so I removed the additional ones you added that aren't there... (if I remember correctly)

The website is clear, but it doesn't look like that at all on the outside. I was in doubt if it was a company selling Philips toothbrushes (they do!) or repairing them. Inside I saw a desk, so decided it was a company office (also because on the corner of the next building there are other dentists). I will change it back to dentist and add the website.

I think the deletion of node 3635381521 is a mistake that should be reverted so the history of that node can be preserved and editors such as StreetComplete will ask if a new business has been opened at that location

That guy has been reinventing the wheel. My guy was 6 years earlier! https://www.bgonair.bg/a/36-sutreshen-blok/65540-ucheni-tvardyat-balgariya-mozhe-da-proizvezhda-zhalti-paveta

I see you are spending a lot of effort to add quotation marks to some object names. I know this is common in Bulgarian, but on OSM a tradition has evolved to not use them. I can't judge if one or the other is correct, but in this case the name of the station as shown on the signs is without quotation marks so here your edit is wrong, I think. I removed them again.

Yes, they are baked bricks, not natural stone so not surface=sett. I know a professor at BAN who managed to recreate their production process.

I know that since their merger, Ceiba pharmacies are rebranded to SOpharmacy, but this one is still Ceiba branded (unless it changed since I passed it 2 days ago?)

I looked at the number of parking spots only

Please also note osm.wiki/Names#Names_are_not_for_descriptions and phone=*#Usage I already reverted your edits

Kindly follow the OSM editing guidelines, including description=*#No_advertising and the format guidelines here opening_hours=*#Explanation_by_example I already deleted your advertising description and adjusted the opening hours format

Hi, Thanks for the edit! Is this a completely new place, or is Halbite still involved? There is still some information linked to Halbite here (website, name in latin script, etc.)

Yes I should have

Reverted! In the Netherlands, such signs have a text ("uitgezonderd"="except") to avoid confusion

I was wondering that too. Is it "all traffic forbidden" + "not for bicycles" = bicycles allowed (double negative = positive), or is it "all traffic forbidden" + "forbidden for bicycles too" = forbidden for bicycles?

I saw you added postal codes to every node in a building. In general it is not necessary to add postal codes because software using OSM data can easily determine it from the location of the building. But if you add postal codes, you should add them to the building area, not the nodes in it.

Will do that. Maybe you are right and they are rebranding from д-р Стефанов to Нечовешkи магазин