Answer: As your orange tree matures, it will set additional fruit. So, the best thing to do is to be patient and to continue giving it good care. Eventually you'll have lots and lots of sweet, tasty fruit.
It sounds as though your banana trees are encroaching on your neighbors property and they are within their rights to remove anything hanging over onto their property. A solution would be to move the trees further into your yard so the leaves won't hang over into your neighbor's yard.
The oregano plant is probably suffering because it was moved. While it may be warmer indoors, the light level is lower and the air is drier. Cutting the tops of the plants down and moving them back outdoors should prompt some healthy new growth.
Best wishes with your plants!
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