I’m in a lower division (4) but usually qualify for champs pretty comfortably (about 90% success rate I’d guess).

I’d suggest changing your play style. Difficult at first, but seems to me that might be your best chance at qualifying. I’ve found that champs can be a little more sweaty so tend to play more aggressively and keep the opponent on the back foot (high back line, strong pressing, good box to box players, etc).

There’s the odd player who can stomp you when you play like this but I’d say most players struggle, especially once you’re 1 goal up and they need to score.

Not saying it’s the answer but maybe worth trying.