This years blooms were activated by chemical changes in the plant last year. Remove the dirt so that next years blooms will be better. Very carefully remove the dirt because this year's buds are just under the surface and you don't want to injure them. The energy they absorb will help the chemical changes activate.

I agree they are too deep. Just washing away the excess soil over the buds will only remove it temporarily. By next fall the buds for next year will be just as far under the soil as they are now. Been there, done that. With extra help I would go straight down with a transplant spade at least a foot beyond the perceived width of the roots all around the plant at least a foot and a half deep. With two spades I would work the whole plant up to the correct height. You will no doubt lose some root tubers that will break in the move. I believe this is your only permanent solution. Al

If you have a leaf blower, just use the forceful air to blow off the amount of dirt you need, to slightly expose the crown. I never damage any part of the plant this way..:-)