Merry Christmas Dave
I think the here and now is more important than leaving a lasting memory...at least as far as art is concerned. I think if you want to leave a lasting memory, be kind, be generous, be loving and caring...because those are the things people will remember most. Sure, they may remember your amazing art as well, but that will be an aside thought to what kind of person you were
I'd rather be remembered for who I was rather than what I did as an artist, but that's just my opinion
Hope you have a wonderful holiday!