I'm absolutely horrific with organisation, but I found a few ways of managing things. I never really managed to grasp notifications, eventually they just became an auto-ignore for my brain. What worked more for me was having hints of what I need to do in places that I would naturally look throughout my day.

For instance, with my iPhone, I use dynamic island to keep my current task in a persistent way. It's not forceful and it doesn't interrupt what I'm currently doing. I've also got a large widget on my home screen which shows me some things like weather, date, reminders and calendar events. I see it a few times and eventually I usually manage to enact on it. I unlock my iPhone more than 100+ times per day, so that's 100 potential opportunities to see it and enact on it.

As for filling it with tasks, I usually do that just before I'm about to go to bed. Once I plug my phone in, I have shortcuts give me a notification that reminds me to fill out the tasks for tomorrow. This isn't bulletproof of course, but it helps to try and make it habit somewhat.

Despite the deficiencies, we're still brains of habit, so trying to make that habitual does help. It does help that it's a task that doesn't change.