If you can't hear it at all, try switching to alarms like smart fitness bracelets. Firstly, it can be really easier to wake up from the "smart wake-up" mode, and secondly, they vibrate on your hand, so this "contact" way of waking up may suit you better.
In general, the simplest and an obvious possible life hack is to place an alarm clock (or a phone with it) as far from the bed as possible, so that you cannot turn it off without getting out of bed. To be sure, you can still put some annoying sound, so that it would be completely impossible to listen to it for a long time, then you certainly have to get up.
If a person has stopped hearing the alarm clock, what does this mean? This suggests that his body has not fully recovered from sleep by the morning, and more time is required for rest. This usually happens in two cases: either with increased stress on the body, most often we are talking about physical activity, because after it the duration of sleep increases, or that a person deliberately limits himself in sleep time in order to increase be in time. This is a more real situation. Therefore, the so-called sleep pressure builds up and prevents a person from waking up by morning.
Normalization of sleep will help. The international recommended sleep rate is seven hours. And you have to ask yourself the question, how much does a person sleep - five hours or seven? If seven, then you already need to look for other questions.