The number of big clubs in this competition is so low that I never get interested in it until reaching the last stages.

Most of the time it gets more fun as of the semi finals.
That's why I'm not so sure about the future of the Conference League honestly. I know this place is a good opportunity for smaller clubs to do better things.
But we rarely see such clubs winning the title. It's been organized 5 times and 3 of the champions have been from the EPL.
The UEFA conference league is just 5th edition, it's still a new European competition that hasn't gotten so much attention like the Champions League and the Europa League, we need to give it some years and you will see big teams will become regular participants.
However, the teams that qualified from Europe top leagues should not be underestimated just because they are not the regular top teams across the various league, so we should accord them some regards because it's still an European competition. 0
As for EPL teams winning the conference league more, it could be that the Europa League and conference league is where they put more effort compared to the Champions League where English teams rarely win it.