Account issue cannot enter marketplace

It's been a lot of days that at the start up of Minecraft it says I cannot enter the marketplace because there is an issue with my account (with a big red exclamation mark). I remember recently finding in the internal storage a folder called "cache data" which I deleted because I needed more space and then the issue happened. I don't know where to ask for support because I can't find mojang email anywhere. I need my account to be fixed so I can enter the marketplace and restore the data.