We can swap sources all day long, not interested. Here's the one that I used. Check out the table, sort it by year in descending order - that means highest to lowest - and there are none since El Paso in 2019.
https://en.wikipedia.org/wiki/Mass_shootings_in_the_United_States#Deadliest_mass_shootings_since_1949
It also depends upon the definition of what a mass shooting is (sad, yes, I think we can agree on that). Read under Frequency - Differing Sources in my source or THE VERY FIRST PARAGRAPH OF YOURS "The precise inclusion criteria are disputed, and there is no broadly accepted definition".
So, gotcha there, I stand by my meme.
Furthermore, you will not deny the central theme, that the gun grabbers will be using these tragedies to take away law abiding citizens' firearms in the midst of unbridled illegal immigration and defunding of police.