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If the tree is not too large, then you might be able to transplant it--but I would do so now (in spring) before it gets too hot, otherwise wait until fall. When transplanting, make sure you dig up as much of the root system as possible and place it in a large enough hole to accommodate these roots. It needs sun and well-draining soil. You may also want to consider trimming the tree to reduce shock. Be sure to give it plenty of water while the tree establishes itself in the new location. Here is an article that you may find helpful: https://www.gardeningknowhow.com/plant-problems/environmental/learn-how-to-avoid-and-repair-transplant-shock-in-plants.htm

I would go with a phosphorus rich fertilizer. This will help with flower production.

Fertilizer and additional water should help. It has been a hot summer and many plants are suffering. What leads you to believe that they are not doing well? This will help us give you more precise recommendations.

this should be helpful:
https://www.gardeningknowhow.com/ornamental/trees/japanese-maple/japanese-maple-problems.htm

This article has some suggestions: https://www.gardeningknowhow.com/plant-problems/pests/animals/get-rid-squirrels.htm

Have you pruned? If the branches have become too crowded, the tree will fruit poorly. This article will help: https://www.gardeningknowhow.com/edible/fruits/pear/pear-tree-pruning.htm

What about fertilizer? Too much nitrogen fertilizer will result in lush foliage growth with little to no blooming or fruiting. Adding more phosphorus, such as bone meal, can help offset this. If you have plenty of blossoms but are not getting any fruit, it could be a pollination issue. The high heat in much of the country has been a factor as well.