I couldn’t find any information about the “map(WiFi.RSSI(), -105, -40, 0, 100);” line on the internet, can you explain what the map and the numbers after WiFi.RSSI() mean?
I have no idea why you posted this question in the topic that you did… it is not related at all.
In fact this is not even a Blynk question… take a look over on the Arduino site for this answer
https://www.arduino.cc/reference/en/language/functions/math/map/