I'd go over the whole thing with a garden fork down to the full length of the blade (about 9 inches). The roots of the cover crop should penetrate deeper and help aerate the soil.

I am a diy housepainter, and what I've done with the high ceiling is to paint everything up to where I can reach with my ladder (and I certainly don't put my ladder on stairs). By the time I'm done, there's just the high walls and the ceiling, which covers our large-ish living room and the stairs. I had a crew sent by a professional contractor come just to spray the high ceiling and the walls of the stairway at the top. I used the same color as the wall paint, same eggshell sheen, and I provided the paint. In my HCOL area, it was, as I recall, $500, and this is a 22' ceiling with wide staircase (2 guys, 1 day), which looks much bigger than yours. In the interests of safety, I would explore options like this. It is easy to test your existing paint to see if it is oil-based or latex. You can google it. If it's oil-based, you'll do an extra step or two, but it's not hard. Another thing to note is that you can do a LOT of prep work in advance of the painting day. You can sand, spackle, and especially tape off the trim, unscrew and prepare the switch plates and vents and light fixtures. You can peek at some diy videos for how-to best prepare. I'd buy a couple canvas tarps, and some of that paper on rolls to cover the walkways to protect your floors. And lots of painters tape, primer, and good quality paint.

Thanks for info. If you just want to keep the rain off the immediate door area, consider a transparent arched awning like this: https://www.wayfair.com/outdoor/pdp/advaning-pa-series-convex-door-awning-azan1025.html If that isn't big enough, consider a glass arched greenhouse-style roof (not the Louvre entrance pyramid) or full greenhouse/sunroom that would have an entrance flush with the garage and house walls that could cover the whole area. Water control will need a lot of thought and careful construction as well as maintenance. You'd still need extra large gutters above it. Google "arched glass roof over patio" for images.

The area around the window, circled in RED, looks to have been infilled with too-deep cement units (wider than the existing wall). So on the side, pointed out by the RED arrow, is unsupported. And on the top, it appears to stick out from the old wall face. Is that what you are asking about? Also, in PINK is the lintel, which looks to be made from clay units, but needs to support the cement units above them. The BLUE arrow is pointing to the makeup of the existing interior finish over these cement units, that you need to figure out what it consists of then do the same finish on this new infill. Though I am not familiar with your country's building practices, from what I can see, this was not done by an expert and should have a real professional redo this. *******I am using the term "cement units" because I don't know what those are, but they look homemade.