How important is CP?

Hello guys. I started playing again after 5-6 years, and having a blast. However, here are a lot of plant pokemon on my town so i thought in get & evolve some of them.

I am level 24, and got to evolve a Jumpluff, but it has very little CP (less than 600CP) even for a 3form evolved pokemon. It has good IVs, but i saw on a online database that it caps on 1850 CP. So i got this question, how important is really CP? Is it worth powering this little girl up?

I am not gonna lie, i find her cute, that's why i wanted to use it in gyms, and things like that.