IMO, Scottish Football is already squeezing every penny it can out of the fans who still attend...so any plan based on getting more from them is destined to fail.
First thing that needs done is to stop the rot. Having taken part in, and seen the results from, fan satisfaction surveys...and what keeps them coming back (or not)...I can say with certainty that positive results on the park come a pretty long way down the list. It's an often given reason, but when you drill down into it you realise that it's actually just an easy excuse and the cause is a bit more complex......lacked identity with the club, didn't feel valued, poor treatment by club, poor value from the matchday experience etc.
Deal with those things and you then have a more positive, engaged support who do the next bit for you...mostly...and that is to encourage more people to attend more regularly.
From there on it's about tweaking the offering to ensure that resources are concentrated where they provide the biggest benefit...to club and fans. That's inevitably going to be supporting families and attracting new young supporters to the club.
Build from the bottom up : 40+ yr old fans who have been attending since 1994 and who have weathered the good and the bad aren't going to need as much convincing/pampering to keep supporting the club as an 8 yr old who's having his head turned towards following a Champions League team that he'll never likely get to see live in person.
Not saying the older fans should be ignored, just that it's easier/cheaper to find things to improve their matchday experience.