7-8 Volts at Porch Light Switch
With only 7-8 volts your hot has opened some place unless using a low z meter. When the neutral opens with a normal meter many times you will read 120-50v but just a few is a sign that a connection at a wire nut probably failed unless using spring tension blocks wago is a popular brand and they normally work well unless there is a catastrophic failure (something that causes the breaker to trip) then they get loose like a back stab.
Since your indoor light works check the junction there. Then in the non working fixture closest to the working fixture it is probably a push in or bad wire nut connection.