I'd walk.
There's a massive shortage of officials across the United States right now at the high school level. A lot of us have quit due to the abuse from fans, from coaches, from players, etc. And some of the assigners think they are gods and have attitudes even bigger than that. So much potential talent has up-and-walked off the field forever due to one or more of those factors.
Now, consider the ones that remain and want to move up to college. There was a time that getting into college ball was a monumental undertaking. Now you can waltz into most college organizations with 2-3 years of experience, if even that, and expect to, at the very least, work a game or two your first year. For the past four years, I've heard about how we college officials are starting to see shortages at the D-3 and D-2 levels because of the lack of officials coming from high school and the good ones moving up to D-1 and NFL ranks.
Point is, with the massive shortage of officials at HS, there's far fewer to move to the college ranks. I, too, have seen college officials who shouldn't even be at that level. Hell, I've watched games on TV where I've asked how someone can be working FBS/FCS and making basic mistakes with mechanics/rules. Yet, they continue to work the next week. HS officials move quickly to college associations which makes no sense. You used to need years of experience before you'd even be considered. Why, then, are college associations taking guys who clearly aren't ready for that level? And then assinging them to the field?
It could be politics. It exists, don't let anyone on this forum lie to you. Politics is the biggest factor in college at all levels. Then again, that's a given, so let's move past that.
It could be that it's something personal. But, I question why they'd keep you around for eight years. Coordinators/assigners will dump guys if there's a problem with you. I've seen it happen many times. If they don't like you, you'll be gone - you won't get a "renewal" for the following season or whatever your association calls it.
It could be professional. In that case, they OWE you an explanation as to where you are not performing, and that's a huge red flag about the integrity of that organization, its assigner(s), the senior staff, the observer(s), et cetera. Why are they letting you remain underdeveloped? For eight years? If that's the case, you walking is doing yourself a huge favor as they clearly either cannot or will not devote the time/resources/energy to you - which is telling you something about them moreso than about you.
It could be that there's simply so much competition in your organization that you are constantly lost in the shuffle - which means, again, you aren't doing yourself any favors by pretending that you will get noticed if you stick it out just one more year.
You know your story better than anyone, therefore, you are in the best position to answer as to where your strengths and weaknesses are. If the association won't put you on a crew and all they are letting you be is a professional button-pusher, you need to ask yourself if you're content with that or not. If you can't get answers from them, then they are telling you all you need to know.
I left a conference a few years ago because the coordinator clearly played favorites and quite frankly he lied right to my face and made a promise he never even moved a single inch forward on. Then he just flat-out ignored all emails, texts, calls. But I listened to him for two more years telling me and everyone else, "Don't worry, you guys are gonna get your chance" - and it never came. I bailed and went to another organization. He's now retired (or, rather, has been made to retire, whatever the truth is, opinions vary). he still has a legion loyal to him despite how he treated a good number of others. I saw the politics, I saw the favoritism, I got the hell out and found out the grass isn't greener.....it simply looks different, but it's still grass. This'll be my final year of high school as well because I'm tired of the substandard performances by other officials, the god-like attitude of a lot of the assigners coupled with the blatant good-ole-boy favoritism, and the level of play in my area.
Can't tell you what to do, but I will ask if it would benefit you more to get out knowing you can't move ahead, or stick around and continue to feel worse with each passing season where you get to press more buttons?
Good luck with whatever choice you make.