YMMV, but in my experience silent switch and o-rings are the biggest contributesrs to reducing noise. Films also help to a smaller degree. Stabilizers are also a big source of noise, as I understand, but I don’t have anything to advise there since none of my boards have had stabilizers.

Of course, changing your typing habits will have a larger impact than hardware changes though.

Square bit as the go-to general purpose bit is the correct opinion. Every time I have to pull my square bit off to put a Philips on I am just disappointed.