I have had my banana plant since march 2021 (I live in Germany) and it has been having trouble ever since - first I had a lot of browning around the leaves (picture 1) that only seemed to increase and last week I cut the brown spots off, being careful to not hurt the healthy leaves. Not it looks like this; (picture 2). I have tried multiple things, pesticides, giving it more sun, giving it less sun, more water, less water etc. Most recently I have repotted it with a mix of fresh soil and sand I had disinfected with boiling water, since I have read the banana plant enjoys sandy earth, I mixed it around 35% sand to 65% fresh soil. I would hate to see it die, does anyone have any recommendations?