Lead quality depends not only on the chats but also on how the keywords are structured. If the list is too narrow, good requests are missed. If it is too broad, the feed fills with noise.
A practical approach is to split keywords by intent: separate sets for rent, sales, bikes, visas, exchange, and other segments. This improves clarity and gives cleaner results.
Minus words are just as important as primary keywords. They remove discussions, repeated messages, job posts, irrelevant offers, and other noise that may look like a lead but brings no business value.
A strong practice is to review found leads every few days and refine the dictionaries: reinforce strong phrases and cut unnecessary noise. Over time, Telegram monitoring becomes more accurate.