Problem with surface texture when painting drywall

Hello,

I renovated an apartment, since the drywall has been painted several times and has a poor surface structure, I decided to sand everything with surface filler to Q4. The walls are completely smooth and I really invested a lot of time. Now the problem is, I bought microfiber rollers with low nap specially for smooth walls and the paint Alpinaweiß, but the texture just looks bad, if you look closely it looks like a lunar landscape. I also tried diluting the paint with water but it also doesn’t look good. Spraying the walls is unfortunately not possible because it’s too much effort to tape everything off.

What am I doing wrong here, or do I simply have the wrong paint for this?

Found the problem, the issue was that the wall absorbed too much and that's why the texture looks like that. Treated everything with primer and behold, the texture is nicely smooth. Additionally used an Epodex latex paint to achieve an even nicer surface texture. Hope I can help someone with this who has a similar/the same problem.