u/IDKijustroamhere

Hello everyone. This is my Dracaena Marginata. Idk if you can tell, but it's not doing so well. I had to remove one of the stems as it was rotten. You can see they were usually three. The trunk is starting to feel soft on the side of the removed stem, but the other stems feel just fine. Two or three leaves have fallen off, and there is browning at the tips of the rest of the leaves. What would you recommend me do? It could be that it's overwatered, so repotting was the first idea I came across. If that's the case, what potting mix should I use, and where can I buy it from? Please, keep in mind that I live in Europe.