keep enhancing; do your node and stone craftng for more of em. it would have been cheaper for you to purchase +7 blues for the price of your +3 purples since the bonus for +7 is way better than +3.
make sure you're doing your daily ruins and running all your rushes for the rewards.
keep your lightstone up to date; prioritize ones that give you substats that increase your attack and defense
use crystals that increase your attack or defense
roll your relics; you get a bunch of fragments every day and the blues really add up to enhance.
Been stuck like that few times. Latest with the Execusioner boss, where I had to go way over the recomended cp to be able to take him down. Anyway, if you start feeling fustrated my recomendation would be to just take a little break from your main character and level an alt. You get boss scrolls and family cp by doing that so it will benefit your main and give you something to do when you have time to play instead of just autogrinding with your main. I also watched some youtube vidoes that said that later on you will want to have multiple levelled characters on your account for some contect that isn't in global yet, so it's not waisted time investment either.