Unless I missed it somewhere else, I think the club missed a beat by not having a dedicated section for flags and singing section, of the top of my head I'm thinking Celtic and Palace, they have dedicated area's when it's pretty much non stop. It adds to the atmosphere, these fan groups we have like 1878 or whatever they are called should really push this. Fund raise for tifos, Flags, get drums, megaphones or whatever needed, I've been to many stadiums in Europe and it's amazing. The bundesliga does it best.
I know we are a reactionary fan base, we need to get mad or score before the decibels lift but I'd be all for a dedicated bunch of scallywags to get the crowd going. Music after goals etc, worth a try