I personally use Sleep as Android which comes with a bunch of options to help ensure you’ve actually woken up. I utilize the “captcha” option in which when I go to turn off the alarm, it displays a screen full of sheep and all of them but one are sleeping - you have to click the one that is “awake” in order to dismiss the alarm. I guess the process wakes up my brain just enough so that I don’t go back to sleep, whereas with a regular alarm that has just a simple dismiss button I’ll absolutely either hit dismiss or one of the volume buttons to turn off the alarm before I’ve fully woken up.

I also have it set to buzz on my watch for 90 seconds before playing a sound on my phone (which escalates in volume) - I’ve not had a problem waking up with this in the years that I’ve been using it.

There are other options too, such as answering math questions, scanning a QR code, pressing your phone to an NFC tag, heavily shaking the phone, one called “Say cheese!” that makes you smile as hard as you can and uses the camera to detect it, and one that you have to “laugh out loud”.