If your OS is so brittle that you can’t upgrade it without “losing so much random stuff,” you’re not standing on solid ground, and I’d argue "it doesn’t work properly either. You’re basically balancing on a house of cards that, and eventually it will fall, and it won’t be pretty. Do yourself a favour and switch to a more future-proof solution, now that you still have proper access to your data. Future you will most likely thank yourself.
If your OS is so brittle that you can’t upgrade it without “losing so much random stuff,” you’re not standing on solid ground, and I’d argue "it doesn’t work properly either. You’re basically balancing on a house of cards that, and eventually it will fall, and it won’t be pretty. Do yourself a favour and switch to a more future-proof solution, now that you still have proper access to your data. Future you will most likely thank yourself.