Macbook doesn't start in MacOS only Windows

I have a Apple MacBook Pro 13 i5 16/512GB Grey(MWP42D/A). A few days ago, I was struggling to get my Samsung Portable SSD T7 Touch to work with it, so I reinstalled the software and tried to restart it. Since then my MacBook never booted on MacOS again.

Things I have tried so far that didn't work:

• Recovery mode (Doesn't show the options and keeps restarting and showing a black screen)
• Recovery mode via Internet (Keeps restarting and asking for my WLAN password...)
• Booting from a bootable USB drive with Sonoma (Keeps restarting and showing a black screen)
• Power cycle (10 seconds holding the power button)
• Safe mode boot (Nothing happens, keep restarting and showing a black screen)
• Reset the PRAM / NVRAM
• Disk utility via my Windows partition (No errors found)
• Target mode through a different MacBook (Cannot get access to my data even after typing in my password)

I doubt it is a hardware issue, because I can perfectly boot and use it on Windows. What options do I still have left before paying 600 bucks to Apple to fix it?

Thank you!