These are hand coding issues that I'd have to do in a premier support ticket if you want me to do them for you.
I'd implement the reCaptcha v3 with webassist Server Behaviors to allow configuration of the error message more easily.
The reset of the captcha I've seen done online, it looks like you just have to add a javascript timer to reset it after 3 minutes.
These are things I can help with in a premier support ticket. If you want to try to do it on your own, then you can ask questions here and I'll try to help.