Just got approved for Qantas Amex Ultimate Card. What’s next for my churning journey?

After meeting the spending criteria and getting the 100k qff points would it be wise to keep this card or close this card and wait 12 months to apply for AMEX again?

Also what should my next step be to churn credit cards? Should I open and close credit cards from different banks on a regular basis? If so please give me a timeline of some credit cards that I can churn regularly that earns qff points. Thanks