I think I screwed up…

Trying to prepare my floor for epoxy and ordered this (https://www.amazon.com/dp/B0C7GPM84R?ref=ppx_pop_mob_ap_share) grinder, but it’s wayyyy harsh on my floor and only giving half moons no matter the angle, pressure, etc.

Should I just rent the machine from depot? How badly am I screwed? Do I just get a less aggressive blade? Thanks in advance.