Try to use a corrector or a peachy tones concealer, one shade darker than your skin tone. It will keep the dimensions of your face intact while giving you the brightness boost u need.
That's a bunch of bs! Undereye fillers when done right are meant to compensate for the volume loss (either eventual or genetically occurring). There is NO reason why a well done undereye filler should make you look "top heavy" 😆