I think this misses the point of what organic singing sections normally are, which is the cheapest seats.
Kippax standing, then the North Stand from 1994, the the South Stand in 2003 from around 116-118 the the first couple of seasons and it was okay. No one wanted to be in 111 with lots of empties so the club decided to create a singing section that part of the South Stand a few years into the new stadium, and this diluted the South Stand helping ruin the atmosphere. Then South Stand level 3 got the cheapest seats by far, loads left to go up their to save over 50% on their season tickets, watching in effect from West Gorton, and being so far away they would never be heard so giving up the ghost of creating any atmosphere.
It is an easy answer, reduce all tickets prices lower tier behind the goal, even United had the sense to do that charging £532 and £28 for the whole blocks, not the first 3 rows like City which are underground, and there is no cheaper option higher up like at City.