I can play on 1.12.2 and older versions, but I cannot play on anything newer than that.
I can't play on 1.13, 1.14 or 1.15, and I don't know why.
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Ok,start by deleting settings in .minecraft.
Then check if you're running the lastest version of Java.
If you are,save the files that you need (saves,resource packs) and completely reinstall Minecraft. (you can get the launcher from minecraft.net)
Reply if it did/didn't work..Have a nice day! 🙂