Easy to fix, just replace libmono.so with original one
First, get unity version. Follow the tutorial:
platinmods.com
Download libmono.so file:
platinmods.com
On the download page, the libmono.so are usally located on \mono\Release\Libs\(cpu architecture)\ or \mono\Release\MonoLibs\(cpu architecture)\
Replace libmono.so with a correct cpu architecture in the APK file. Example: replace armv7 libmono.so to \lib\armeabi-v7a
CLANS:Destiny Love is a good example to try it. It has armeabi-v7a only and Unity version 5.6.6f2
This method will not work if the game is using external protection that hooks libmono.so to load decrypted dll, you would need to bypass it. Due to stronger game protections these days, I will not teach how to bypass no matter what.
First, get unity version. Follow the tutorial:
How to get unity version from any asset file
Since the Il2CppDumper require to input unity version in the 1st quarter of this year, I will show you how to easly get unity version from APK file. This method will also work on any platforms such as Windows, iOS, Nintendo Switch... Requirements - Winrar - 7-Zip - Notepad++ or any Hex editor...

Download libmono.so file:
Unity mono stuff for Android
I hosted them for anyone who need the original libmono, Managed dlls or other stuff to fix the games for Android Download links below: Google Drive: Unity files for mono – Google Drive Mega.nz: 3.28 GB folder on MEGA To download a specific folder, right click and choose download and it will...

On the download page, the libmono.so are usally located on \mono\Release\Libs\(cpu architecture)\ or \mono\Release\MonoLibs\(cpu architecture)\
Replace libmono.so with a correct cpu architecture in the APK file. Example: replace armv7 libmono.so to \lib\armeabi-v7a
CLANS:Destiny Love is a good example to try it. It has armeabi-v7a only and Unity version 5.6.6f2
This method will not work if the game is using external protection that hooks libmono.so to load decrypted dll, you would need to bypass it. Due to stronger game protections these days, I will not teach how to bypass no matter what.