because it's not like val pros could break through an already made scenes with well established pros. Same game same concept. Valorant on the other hand was a new game with new abilities. Switching games while being a t1 t2 pro would be a mistake
secondly, the entry barrier to go pro is cs is incredibly high, there are so many 16-17 yo incredibly cracked kids whos been playing cs for 6-7 years constantly and are playing in acad leagues rn along with experienced cs pros playing tier 1/2/3 since 2013, there's just too less chance of being a cs pro unless you have some exceptional talent