FWIW,
At least 2 of the acts at Beverley actually met at the Area 2 stage in Beverley; Moore, Moss and Rutter; and Blackbeard's Teaparty, and they are very accomplished. Why were they on the bill? They are obviously more than just good musicians, are really going for it and have gone down the right PR channels and served something of an apprenticeship at the appropriate festival.

Others less successful also have talent, but need to look at what these 2 groups have done, or the likes of Sam Pirt, also on the bill.
Perhaps you haven't knocked hard enough on the door. You need persistence as well as talent.