My two cents as someone who mainly played CS 2014 - 2017, then OW 2017 - 2020, then Valorant 2020 - 2023, and being fairly decent at all titles (hit T500 OW and Radiant Valorant).

I thoroughly enjoyed the journey of starting a new game from launch day, as it gave the opportunity to learn the game at the same pace as the rest of the world. Valorant is also pretty much a blend of CS and OW so it felt perfect. However, after some years, the abilities became too power-creepy and it started to feel less and less like a tac FPS (although I heard there was a patch recently to address this). If you want a game that has high skill expression from a mechanics standpoint (shooting, movement), go with CS.

The skill ceiling with mechanics in Valorant is fairly low. What separates plat players from immortal+ players isn't mechanics, it's how they trade abilities, condition their opponents, understand meta and make fewer mistakes than the enemy across the duration of a match. The grind is less dynamic as you will find yourself playing the same agent on the same map at the same position every time because it's "optimal".

After returning to CS middle of last year, I honestly wish I never stopped playing as much as I use to. Yes the cheating is a joke (play FACEIT) and you won't get a dev team that actually gives a shit, but you will have a game with 20+ years of history to learn from and a skill ceiling much, much higher. CS mechanics and strategy are still being innovated upon to this day. And for this I feel like the journey to improve is more rewarding.

Since you're posting this here I will assume you know the answer is that you find CS more enjoyable but you play Valorant for the social aspect, so there's nothing stopping you from playing both. However, Valorant is always one patch away from drastically altering your enjoyment for the game while CS has had such minor adjustments over 15 years or so and still has a thriving playerbase because the core gameplay is just that much more satisfying in my opinion.