I moved into this house 4 years ago. an year after the move we converted our grass sideyard to pavers. We have cherry plum tree that we did not alter. For last 3 years or so, it has been giving very less fruit. The branch shoots are vertical and some part of the tree has no leaves. Also the amount of fruit has been reducing every year. I will post pictures tomorrow. I put a small amount of 10-10-10 fertilizer a couple months ago. Also pruned the tree in fall(Some dead branches are still left). Any suggestion/ways to revive this tree?