Worked hard and credit is at 754-766 between 3 bureaus. Aiming for 800
First card Credit 1 cl 1500
balance of $300. Had since 2021

Amazon Chase increased cl to
19 k
balance of $400 Had since 2022
AC offering balance transfer....
1)Will my credit score take a hit for closing and transferring balance to Amazon Chase?
2')Is it worth the inquiry to now apply for a better card (Amex or Discover) to replace Credit1 card
3) What's considered satisfactory# of inquiries on cr.
Ty for all help
Being super conservative.