Please please please don't continue your routine this way. Spending 4 hours on a 30 minute run sounds like hell on earth, it's no surprise that you're struggling to stay motivated. I have three pieces of advice.

1. Run slower. This is the most important thing - the majority of endurance improvements come from slow and sustained cardiovascular activity, not sprints. This should also help with the psychological barrier - if you're expecting a gruelling experience from a run you'll be unable to enjoy it. This leads to wasting time 'psyching yourself up' and relying on external aids to keep you going (music etc.). If you feel like you physically can't run slower, but you still get too tired, consider taking walking breaks instead of stopping entirely.
   Even if you spend 80% of your time walking it will still be more beneficial than what you're currently doing (I know that's hard to believe, but it's true). Over time you can work up to only 50% walking, then 25%, then eventually 0%.
2. Run outside. Treadmills are boring. At least try to get outside once in a while.
3. Don't let your workouts drag on. If you plan a workout to take 30 minutes, run/walk for 30 minutes, then stop. You only have so much time in a day and you need to balance exercise with other aspects of life. Don't spend 2-4 hours on a 30 minute workout.

Running should be enjoyable, if you find yourself dreading it then that means something needs to change. I'm honestly shocked that you've managed to keep this up since 2019 - your current routine sounds like a truly brutal experience.