Try support:
https://help.minecraft.net/hc/en-us/articles/27554449862285-Fix-Crashes-and-Lag-Issues-in-Minecraft
Or have a look at:
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I’ve been having a problem lately where every time I open the Minecraft browser on my Mac and press play on the Home Screen launcher it begins to prepare but crashes, it’s done this about 100 times now .
i cannot access any worlds as the launcher keeps crashing, does anyone know how i can fix this or get it repaired? I can’t really uninstall and reinstall it as it’s not an app. Thanks