You can do it yourself, but if you are not experienced or don't know exactly how deep the slots should, be let a luthier do it.
I won't go too low in the first step.
Try G 7mm, D 8.7mm, A 10mm and E 12mm at the end of the fingerboard.
This should be much better and useable for a lot of different strings.
If it is still too high, go half a millimeter down again and try it.
You can go down half a millimeter again if needed, but I won't go any lower than that. At least until you played the instrument for a month with this bridge height.
If you go lower, you might need to get adjusters installed if you later want to get strings that have a larger vibrational amplitude.