ᐅ Smoothing textured plaster

Hello everyone,

We have started patching the roof of our shed sporadically; the old one had collapsed when we bought the property. I have attached a picture for you: Is it possible to smooth out this plaster? Or to even out the chipped areas along the top edge? We would like a neat and smooth plaster finish, similar to what is commonly found on modern detached houses. Although it seems like there might be a slight texture in it.

If anyone has concerns about the roof: the material was free, and since we are not yet 100% sure whether the entire shed or just part of it can remain (due to boundary building restrictions), we have decided to only patch the roof sporadically for now so we can store things underneath it. Once it is clear what can remain, the roof will be properly redone.

Image coming soon. The file is always too large.

Here is the picture

A bit small, but unfortunately the image size is limited.

Does anyone have an idea or professional expertise?

Do you want to repair only the top edge now or smooth the entire wall instead of the uneven plaster?

Best regards briefly