Minecraft worlds won’t open(sorry if I seem annoyed by I’m about to break)

None of my Minecraft worlds open(no it’s not my internet) I’ve cleared space on my device, in my Minecraft database, and if I do get in the world I can’t do anything and the game crashes almost instantly. I’ve had this problem since the 30th and still nothing has been done to fix it; I’ve read thing online, looked through forums(including this one) and there is no mention of a fix(The more annoying part is that I can’t play a Minecraft world that I spent a lot of time making with my family, including my 10 year old cousin).