I use a visual timer all the time, so I can see the red part getting smaller - plain number timers are no use for me for time blindness.
Also finally gave in recently and installed Siri on my phone - actually been really useful, as a lot of forgotten things pop into my head while I’m driving, so I use Siri to verbally set timed reminders/alarms for later when I’m able to deal with it.
I heavily use an A5 weekly planner that has diary on one side and notes the other side, so everything that’s scheduled is in the diary side, and the other side works like a bullet journal for my rolling to-do list, and I traffic-light tasks on that side with highlighters to help me prioritise. The traffic light system genuinely helps me, otherwise it’s just an endless list I start ignoring.
Magnetic whiteboards on the fridge for shopping lists and house tasks, family weekly whiteboard for another visual reminder of relevant stuff.
Post It notes for short term reminders.
And anything I need to do habitually has to be ‘in the way’, so my meds have to be blocking my tea mug etc, and if I have to take things with me I put them on the doormat when I first think of them, as no chance I’ll remember unless I have to trip over them. Plus more post it reminders on the door frame, over the keyhole…
Hope some of that suits you, I find physical reminders help me the most, as I can ignore digital stuff very easily. Apparently the brain processes and stores physically writing in a different memory area to typing on a screen, which makes sense for me.