After deleting something important, I downloaded and tested different data recovery apps on my Mac, but no meaningful files could be found. So is there any better software to get all my files back? I really need them.
Hello, firstly, you should know that most modern Macs come with SSD drives, which means that SSD TRIM is enabled by default. TRIM is a feature that optimizes solid-state drives by immediately erasing all traces of deleted data as soon as a file is deleted. 
Maybe some top-class or professional apps can help you. 
If you delete the files permanently, the possibility of recovering them is small. And as you say, you tried many apps but got everything meaningless.
For the app used for both new Mac users and tech-savvy, which can solve many accidental deletion issues, iBoysoft Data Recovery for Mac seems to be a good try.
You can recover your important files with it:
- Open it after installing then select the drive which you lost the files.
- Click Search for Lost Data.
- Wait for the scan.
- Browse the results and choose what you want then click Recover to save them to another place.
Hope you can find them all.
Whether you have backup or not, maybe you can learn some fixes from this post Recover Deleted Files on Mac Before or After Trash Emptied
And for the data recovery apps, I hope these apps Top 8 Mac Data Recovery Software in 2024 | Free & Paid from can help me, good luck. 
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Thanks, I’ll try some fixes there.
I think this resource may be for you: Best free data recovery for Mac