Any tips on end game leveling

Ive been playing this game for 2 month now and i cant figure out how to boost my team past 24k cp. Ive seen tons of people with 35/45k cp and i just want to know whats the best way to elevate my team or is it simply just based on the gear?

Ive been playing this game for 2 month now and i cant figure out how to boost my team past 24k cp. Ive seen tons of people with 35/45k cp and i just want to know whats the best way to elevate my team or is it simply just based on the gear?