I mostly sing a song for a reason, sometimes it may be I have no ideas but Nov 5th, Oct 31st, Easter, Burns night or Paddy's night gives me a reason and usually a song. If there is no club theme is give the song some connection and hopefully a better performance.
At the Somers FC (Worcester Fri Albion) we had theme nights and still do AFAIK. The Minchinhampton FC (Gloucs) Thurs Crown they have theme nights Valentine's day etc.
Lechlade FC (last Fri of mth) Trout had a Halloween night - costumes galore.

When I started I found that singing against noise usually resulted in pitching too high.