Hello guys I am having my plant since semptember last year. Had no problems until april this year, when it started to die. I dont know what is the reason and I really hope someone can help me . Thank you :)

The symptoms suggest not enough light and soil that hasn't dried out sufficiently.

Keep you Marginata close to and right in front of a sunny window. Direct indoor sun is not a problem for this plant. Allow the top 2 inches of soil to get dry before watering. Make sure no water is collecting in the bottom of the pot after you water.

Hi Will ,thank you for the answer :)
I was thinking that the direct sun light is bad for it. Actually this bad period started when the sun appeared late march beggining of april. It might be also the soil not dried out even dough I dont think I over water it. Putting around 300ml eveey 7-9 days. The surface of the soil is almost always dry. Could it be also something with the pot, not be able to breath properly or not enough air going in maybe, which is the couse of the not dried soil ?!? Dont know , but I really want to mentain flowers home and it is making me feel bad when I cant do it. And sometimes it is a very small change , that can make anhuge damage on the plant :)

It takes quite a while for a plant to react to adverse conditions (unless they are extreme). It is likely that your moving it to better light and its subsequent decline was simply coincidental, not cause-and-effect. It is hard to imagine that you could provide too much light for it in Denmark in March/April!

To help you determine the soil moisture content, I suggest you remove the loose soil on the surface. It serves no purpose, but it does dry out quickly and misleads you about the soil around the roots. Then, allow the top inch of soil to dry before waterings. That drying out is what will allow oxygen into the root zone. I cannot tell you how much to add except that you should add enough water so that a bit drips through the drain holes.

It will take a while before you see any improvement after you increase the light and water as I described, so be patient.

Thank you very much for the time and the advices you gave me. I will try to fallow them and I hope soon I will send you picture of it improved and looking better :))
Really helpful