My daughter's private K-12 Christian school has a better approach to fundraising than the GTAA. We've got to start ingraining a culture of giving to the GTAA in our students and recent alumni by publicly and repeatedly setting an expectation. If you repeatedly email every student starting in their 3rd year that the average gift to the GTAA is $100/yr with a link for them to set up an auto draft commitment with a tracker for their class against the target of $1,000,000 / yr contribution with a concerted challenging of their pride to beat that goal and be the best graduating class ever to commit to giving... well, that's increasing the GTAA budget $1M every single year because you've set up a recurring revenue stream with each class that graduates. Then you challenge the old folks 10 years out of school with a targeted "really, class of 2013, you're going to let a bunch of new grads beat you?" and make it a big point of contention for homecoming. Make sure some of it goes to NIL within the rules, but that's what I'd do if I were in the GTAA. Have it setup so every alumni is getting those emails at least daily from the first game week until they donate. Annoy them into giving money. Make it a recurring payment they forget about. Explain why this is so important. Use the alumni commitment to garner donations and partnerships with local businesses where you're bringing them in as donors rather than it being a business transaction for advertising/naming rights.
Simultaneously we need to improve the fan experience and use the school to force students to be engaged fans. The stadium audio, event flow, etc are all uncoordinated garbage. Just get someone who knows how to put on an event. Make it easy for fans to park, tailgate, and get to the game on time.