The point isn’t to limit how many championship games an official can work - the ultimate goal is to get coaches out of the election process, and also to ensure that as many officials as possible have the opportunity to call a championship game.
If your objective, your goal, is solely to call a championship game, and you feel you have no other motivation to be an official, then IMO you’re doing this for the wrong reasons. Or at least, not the same reasons as me.
Like most officials, I’ll likely never call a championship game. If I do, great, but I’m still going to want to keep calling, and keep improving, and get better. I derive quite a bit of satisfaction from this avocation, and it’s not tied to just calling a championship game.
You may have other reasons, those are mine.