For optimal card sign up paths check out this credit card flowchart from r/churning: https://www.reddit.com/r/churning/comments/9hf4ex/faq_credit_card_recommendation_flowchart/
I would also recommend reading the links under Basic Reading for r/churning:
Miles vs Points: https://www.reddit.com/r/churning/comments/74hghz/miles_vs_points_what_are_they/
Why you should not churn: https://www.reddit.com/r/churning/comments/8m487c/why_you_should_not_begin_churning_v30/
Credit Card Decision Flowchart: https://www.reddit.com/r/churning/comments/9hf4ex/faq_credit_card_recommendation_flowchart/
Beginner’s Chase Guide for Under 5/24: https://old.reddit.com/r/churning/comments/9sgpmk/beginners_chase_guide_for_folks_under_524_v_20/
I’ve also written an accumulation of what I’ve learned about churning that could potentially be of use to you: https://www.pezant.ca/blog/a-beginners-guide-to-credit-cards-churning/
If this was useful to you, please consider using my referral links for cards that you’re signing up for: https://www.pezant.ca/blog/referral-links/