Did you grow this from seed?
Citrus from seed are huge trees. I mean 20 feet tall. Of course a container will shrink it but something from seed is not going to work in a container. Secondly, they take at least seven years to get fruit when grown from seed no matter how big the tree is. Third, the tree is tall and skinny because not enough light. It thinks that it is growing in the bottom of the jungle and that it needs to get really tall and reach above the other trees for light. It's pretty hard to simulate sub-tropical sun when you are in the north or indoors. But really intense sunlight will reduce this, but not totally get rid of it because it wants to grow into a huge tree.
If you simply take a cutting of the tree and root it into a new tree you get a smaller bushier type of tree. This is why commercial growers never grow from seed. That and also citrus is not true to seed, you can get sour fruit from planting a seed from a sweet tree, or fruit with too many seeds or too thick skin etc. or that ripen at different times. So they clone them through cuttings so they know what they are growing, but also to keep the tree small and bushy so all the fruit can be reached. Then they may also grow it on different root-stock which can produce a larger tree or not depending on the type of root stock but pretty much always smaller than something grown from seed.
And if you need to you can cut the top off and let it branch out that way, then you'll get three or four branches that start growing upwards as well. It takes so long to fruit that it wouldn't make any difference in terms of fruit in my opinion. The best option is to cut pieces off and root them. Though when I try to root stuff I usually fail, but if you can get a cutting to grow roots its going to be smaller and more bushy. And by smaller I mean its still going to be a huge plant for indoors but it will be manageable in a large pot.
When I was growing citrus up north- my dwarf meyer lemon which was a rooted cutting I ordered, I had to leave it outside in the sun during summer, then had it near a window with grow lights in winter though it didn't get as much light as it wanted in winter. They will adapt somewhat to their environment but they like to have full sun they aren't very good as a house plant. It's going to bend and stretch looking for sunlight.