Use Draw Sense: Earth (drop skill for Aster, Crowler, Bastion) to get Gozuki to your hand, and Good Goblin Housekeeping to put Despair in your deck if you get it in your hand. The skill Restart can work as well.
To help with more consistency, you can use the skill "Restart". It's available to Jaden as a drop skill.
Alternatively, you can use 3 Fusion Recycling Plant with only 1 or 2 Polymerization since it can help with search, as well as returning a card after a fusion. This can prevent you from forcing to discard a crucial card if you want to negate Chazz's cards.
It's better to summon Dark Paladin if you have at least 1 card in your hand that you can discard in case Chazz uses his Lightning Vortex or Level Up!, but generally you'll want to summon Dark Paladin early in the duel.
You will need to have Dark Paladin and Dark Flare Knight out on the field so you can reach over 10,000 damage on the final turn, but doing over 5,000 damage is usually enough to get 8k Duel Assessment during the bonus 1,000 DA campaign.
It's important to remember not to negate your own spells, especially during the last turn, with your own Dark Paladin. It's safe to cancel the prompts during the last turn since Chazz can't do anything to stop your sequence of cards.
Use "Restart" skill to help make sure that you get Backup Squad in your starting hand. Chazz won't attack you unless the total attack of his monsters are higher than your LP. This helps with stalling the duel for a few turns.
If you don't get Backup Squad early in the duel, use your traps conservatively by activating them only if you are about to lose the duel.
Last turn: summon Cosmic Compass --> swarm the field with the token, summon 1 of them in ATTACK POSITION --> use Creature Seizure on the attack position token --> activate Double Summon --> summon RA, decrease your lp to 100 --> attack the token for game!!