so my name now is soda_shark and I cant get into my chests because I changed my name

 

If you cant get into your private signs try right clicking them and they will automatically change to your new in game but if it doesnt work you can get a full mod or a super mod to help you break them. But if it's the trade shop sign then break the block that it is placed on unless it is placed on the chest therefore you need a super mod to break it for you. Tagging some mods to help you Jamesy Laini Kerahna Talia SakuraWolf

 

Handling this in-game