My question too elliedaisy, did you prune it? If you,prune in spring it will delay flowering,by several weeks and if hard,pruned may not flower at all this year.
I grow few varieties and they all flower easily without any special treatment. No, I,wouldn't move it if it has been flowering in previous years in that spot. Potentilla roots can be pretty widespread and at 9 years old prob would not like to be moved at all.
Possibly it is too dry....last year was a wet one though, and you said it hasnt flowered for 3 years......so maybe a good organic feed of fish blood and bone, a good watering and a good mulch. I sense though that ??ou have pruned ....last year or this....quite severely! Maybe too big a bush?