I tried all sorts of loud alarms, moving my alarm on top of a book shelf. Nothing worked, except an alarm that required some mental load. Found an app which let me set a challenge, solve some math sort numbers, that solved it for me. I am sure there are many options so feel free to pick what you like, but I use the app “I can’t wake up” on Android. Started with the free version for years but paid for it a couple of years ago as it has helped me so much.