hey folks, need some help. i am looking for the next sets of cards to churn for myself and the mrs.

1. we just finished our alaska churn.
2. mrs just cancelled her amex plat at the beginning of august. i did have an amex plat but cancelled it approx 2 years ago. not sure if i can get the bonus if i sign up again.
3. looking to get aeroplan points to redeem next year for F rewards. mrs need an extra 15k points while i need 50k.

need suggestions on best cards to sign up for.