I've been researching "why it takes trees from seeds so long to fruit" and why trees don't fruit in general and I found the following reasons.
The tree isn't old enough? Citrus trees don't really go by years, they go by how many nodes/nodules/set of leaves it produces and that varies from tree to tree. If you prune the tree before it starts producing that lowers the node count and the tree has to grow those back to get to the magic number that makes them set fruit.
The next thing is chill hours and some say they need to go through a frost to kick them in gear producing fruit. If you're bringing it in in the winter then this could be a problem.
Next is container size, soil and fertilizers. How tall is that tree? It should be at least 8" or close to it.
Good Luck and don't give up on it, you've had it this long so what's another 4 years!!!!!
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