@Angie520 Simply answering an Inquiry within 24 hours is all that's required- you don't have to either pre-approve or decline. You will get annoying messages from Airbnb pressuring you to pre-approve, but you can ignore those- as long as you have messaged the guest back, your stats won't be affected. Don't ever decline an Inquiry for that reason- no need to lower your acceptance rate for an Inquiry.
Don't lower your rates. Yes, some hosts have actually raised rates to cover the extra COVID cleaning.
Personally I'm not hosting at all right now, due to COVID and the fact that I home-share. Not worth the risk to me.
But if I was, and even if I had an entire house listing, I wouldn't accept guests from COVID hotspots, because I would not want to be a party to them travelling at all (even if that just meant they'd book something else and travel anyway, at least I would't have facilitated that, but that's just my attitude).
Although, as I'm sure you're aware, anyone could be carrying the virus, even if they were from some relatively safe place.
And many Inquiries you never hear from again after you've responded to them. It's pretty standard.
Also be wary- many people who are booking since COVID are newbie guests, have no reviews to go on, and are just looking to throw parties. They especially target new hosts because they assume you aren't experienced at vetting guests.