Ah, so you have a custom keyboard withn custom keycaps in resin maybe got from artist or Temu, i dont care!
i installed my custom resin spacebar and surprise! the spacebar was way higher than my other very normal keycaps.
I mean what could go wrong?
if you are a strange person like me who like to hit the XCVBNM with the thumb well with keycaps like this your thumb will be sad AF!
So i made this little raiser that just sits in the switch and raise the keycaps about 4mm. i suggest to use PETG as it will be bit more flexy.
Feeling: in my opinion they fit pretty well my case, you will notice almost no difference. But hey this is personal. give it a try!

When you install the raiser please be firm but precise, once installed and pushed all the way down, it will be strong.

First install the raiser on to the switch and then place the keycap on the raiser, then just apply enough pressure all the way down to get the perfect install.