Honestly, if you are not having fun with your characters and you're not past AR 30, I would just reroll on the side.
With your newfound knowledge, you would probably progress faster, save more resources since you know what to do now, and have fun now that you get the character you wanted to play and enjoy.
BTW. Rate up banners guarantee pity for the 5star on banner (Klee right now) is 180 rolls.
90 rolls is just for 50/50 chance for banner 5 star or random 5 star.
Then the next 90 rolls is guaranteed pity for the banner if you haven't gotten them yet.
Your rolls also carry over into the next banner if you haven't hit pity.