Fix Minor issues with Contact Form 7

I have 4 contact forms on my WordPress website using Contact Form 7.
Contact forms are working fine.

I need these issues to be fixed.

1. Ajax Loader animation is not showing
2. Fix the UI of the success message on Desktop/Mobile
3. After form is submitted, the page gets redirected to www.domain.com/myform/#wpcf7-f777-p981-o2
I guess its something to do with combining of JS files by caching plugins.


OS: CentOS 8
WordPress 5.8.1
Relevant Plugin:
- Contact Form 7
- jQuery Validation For Contact Form 7
- WP Fastest Cache
- W3Speedster

Note: I don't want to install any additional plugins
** Apply only if you are really experienced with CF7. Its a live site and I do not want any experiments.**

Budget: $15