Open all the files in Vim either by starting that way or with something like :args, then :bufdo normal @@ to execute the most recently executed macro on all buffers.

On occasions when I’m doing things more iteratively (because I’m using a few macros and personal judgement), I commonly end up with :wn<Enter> in one of the macros.

Not sure if this is rhetorical, but you can (1) use rg -l to open a bunch of files in vim (2) qq make change, select next pattern, esc. (3) qr 100@q :bufferdelete esc (4) 100@r

If it’s a simple replace symbol, its easier to do it with rg -l and sed -i, of course.