Stop selling hospitality all over the ground for a start would help. Bigger stadium didn't help one bit from 2016, seems to be far less general admission tickets now then there was before the stand was built. Love to know the real breakdown of ticket allocations, used to say 27k season tickets didn't they few years back. They added a couple of thousand to that in 2016.
I bet these figures aren't that far off
29,000 Season Tickets
10,000 Members
2,000 Club tickets (Ex players, staff, officials etc)
3,000 Away Fans
Leaving 10,000 Hospitality? 1 in 5 tickets? Wow
Not far off, but you're forgetting a few groups:
Sponsors
Competition organisers (UEFA take loads for example)
Local members sale 500 a game
Local general sale 500 a game
Supporters club allocations will total up to 500/1000 a game easily if not more
Schools get 60 a game
Thomas Cook had 330