You know that you don't have to replace every single component in your PC every time you upgrade something, right?
And no, 500 GB (SSD) was the low end fairly recently. Heck, it's still fair enough nowadays, I have a half-empty 1 TB drive and could easily bring that down to 350-400 GB.
Coming from the Land of Muesli, it's really quite simple and it's really the same way we eat any cereal over here:
If you like it a bit sweeter, mix a fruit yoghurt into it. Personally, I add the yoghurt after the Muesli and stir/mix it a bit before adding the milk.
Of course you can also add fresh sweet fruits (bananas, removeds, strawberries, peaches, etc.) cut into slices/cubes.
If you prefer vegan milk alternatives, oat milk works great. Honestly, I think a good oat milk complements the Muesli (which usually contains oats) better than cow milk and I would suggest everyone try it.