As max said, either use AP on auto speed; or on the record round in pet arena. (When you reach level 40)
You should save AP for now.
As for gold, you can focus on your gold income (coin count -> Gold rate/Huge loots -> Triple Size)
I'd assume you haven't done this already:
http://iourpg.wikia.com/wiki/Codes
Go here, copy all of the codes one by one and paste them into the code 'section'.
Code 'section' can be located by going to: Social -> Code
As you've completed all the worlds, if you don't have a carry you should farm World 4 Stage 11 for fastest exp/time.
Be sure to save your crystals for unlocking Orbs, from which if you're struggling you can grab the Auto Damage orb and level it up until it reaches 2*.
Further specific information on the wiki.
You should save AP for now.
As for gold, you can focus on your gold income (coin count -> Gold rate/Huge loots -> Triple Size)
I'd assume you haven't done this already:
http://iourpg.wikia.com/wiki/Codes
Go here, copy all of the codes one by one and paste them into the code 'section'.
Code 'section' can be located by going to: Social -> Code
As you've completed all the worlds, if you don't have a carry you should farm World 4 Stage 11 for fastest exp/time.
Be sure to save your crystals for unlocking Orbs, from which if you're struggling you can grab the Auto Damage orb and level it up until it reaches 2*.
Further specific information on the wiki.