Never Cha17 unless you want the actor feat.
So, at level 5 you'll be paladin 2 / sorcerer 3.
If you push fighter, you won't get your 3rd attack until level 16.
If you keep paladin, many things happen 2 levels earlier: ASI, extra attack.
At level 12 you are paladin 2 / sorcerer 3 / EK 7, war...