The older I get, the more the whole "legacy"/impact issue seems overhyped; pg (and everyone alive today) is not going to be remembered for long either; perhaps 2 more generations, and it's a wrap. No one is remembered forever. That thought keeps me rooted firmly in the present and on the immediate impact I can have.
I have never been into poetry, but both versions of Ozymandias (Shelley's[1] and Smith's[2]) deeply resonated with me. I wholly agree with you, your impact, and your legacy, is with the people around you, in the here and now.