Alerts focus on the details you need to act quickly:
Use email if you want a slower, searchable record of matches.
Use WhatsApp if you need to see new matches quickly or send them into a shared chat.
nestrrr dedupes matches before notifying you, so the same listing should not keep appearing from the same monitor.
If a search is quiet, do not assume it is broken. Some areas simply have thin supply. Widen one constraint and watch the next few cycles.