@Yang147 When a new listing goes live, it gets a temporary boost in search results that expires after a couple of weeks. Declining requests or cancelling instant-bookings may have some influence on the search results too, but they won't affect a listing nearly as badly as having an unsuccessful stay and a bad review. With that in mind, it's best to keep on declining inappropriate requests but also make sure you set the right parameters (maximum stay length, etc) and keep the calendar up to date to avoid unnecessary declines.
When your first review is published - and hopefully it's a great one - two things will happen: you'll get a little bump in the search results, and also guests who are skeptical of unreviewed listings will be likelier to book. It's a waste of time trying to game the search algorithm; the most important thing you can do right now is impress your first guests and earn that gushing review that will inspire more people to book.