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This might not be the answer you hoped for, but your best bet is learning Linux Basics, getting used to the file directory, and manually finding and deleting the Data.
It sucks at first because it's new, but you'll get the hang of it!
And in the worst case, reset.
I recommend using some official app from the Linux app store to see what directory is hogging all the space.
I used to use a clean-up app that let me manually delete files easier and it worked great, but sadly it vanished from the store.
Just like PoweredCoffee commented, avoid using apps to "auto-clean" temp files and such (ie ccleaner, which i think "fell from grace" and popularity sometime ago), because sometimes you may accidentally delete something that could create a snowball effect of problems later.
If you are 100% sure you wont want back a file when deleting it, you can skip the trash bin if you add the option "delete files" to right click menu in dolphin file manager.
You can also reduce the amount of "backup versions" of programs you have installed with the package manager with a command (i think the normal amount is 5 versions; you could reduce it to 3). this backups are made to offer the option to "rollback" an update if its bugged or is not working properly.
An app to find which files are consuming space is QDirStat, K4DirStat (search this one, since it uses KDE libraries, so it should take less extra space), Baobab and Filelight.
https://www.maketecheasier.com/clean-up-hard-disk-storage-qdirstat-linux/
if you use an external storage, or secondary disk, try using AppImages of some programs from there, so you dont have to consume space of your main disk with them (which will happen with flatpaks, or more common installations).