When attacking a city, try not to do it without a jackpot.

Why?

When attacking a rival city, doing it without a jackpot means winning half as much as if you do it with a jackpot. This difference can be crucial when it comes to winning a war, besides the fact that the jackpot can also be used by other members of your team and continue to score double points.

How should it be done?

Keep in mind to buy as many jackpot boosters as you can in the war commercial building store (especially the smaller 10-minute ones). And just before attacking, put the jackpot booster on the enemy city you are going to attack, and proceed to launch your attacks. Do it fast and you will get the maximum points that, on the other hand, will make you win levels in the War Pass, getting cards, SimCash, purple battle coins, etc.