They didn't use bots to upvote that one video from the internet's edgy gore phase, that includes a woman and eating cereal in a disgusting way? Very unlike the internet.
Do you mean orange juice on oats? Because that apparently works and the two combined are healthy or whatever. Or do you mean full on cinnamon toast crunch, frosted flakes type shit? Frosted flakes doesn't actually sound that bad.
Oj is really not that healthy. It has a ton of calories and is almost pure sugar. As a type 2 I can't have any, and if I can't have it, then no one should, lol. God, please just let me drink oj and eat rasins again.
No milk. Use fil (sour milk), yoghurt or something similar. Put cereal on top, no mixing. The cereal touching the "liquid" get soggy while the rest stays crisp giving the best texture heterogeneity. Berries are awesome, frozen a super convenient alternative. If using frozen mix these with dairy before adding cereal.
Your fermented dairy of choice brings a nice crispy and fresh acidity to the meal. And if it (still) have an active bacterial culture it is super good for your gut.
Jam, agave, or maple syrup should be good with muesli & yoghurt to my taste. Light molasses may work in moderation, and I've heard good things about sorghum syrup.
That is my preferred breakfast. I prepare it the night before in a glass to allow the bottom layer tons of time to soften like you say but then I mix it all just before eating. I tend to use kefir since if I want fil I've gotta make it myself but as you say anything similar gets the job done.
Cereal is (unsurprisingly) supposed to be prepared like "overnight oats" and similar gruels. Pour the cereal in the milk, leave it all out overnight to soak up the juices, wake up to a breakfast revelation.