Does it get any light where it's currently placed?

Prune it hard and/or change the planting angle. After you prune, the top leaf should be on the side of the stem that faces an imaginary line vertical to the point at which the trunk leaves the soil. The branch that occurs in the axil (crotch) of the leaf will want to grow straight out (not necessarily horizontally) from the trunk's center axis, but it's important to understand that the plant's phototropic response to light can trump that tendency.

This should be helpful.

Al

@liz It is just beside a very big glass door.

@AI

Thank you for taking time to reply! according to the image below, i should trim at the blue line leaving just a leaf, but it won't encourage the growth on the red line?

I did a hard prune and after a month of waiting buds are forming in various places except where I wanted it to be - at the bare Y fork. what should I do at this moment?

The effects of pruning diminish as the distance from the pruning cut increases. You can do 2 things, and I think where you live should be the deciding factor. If you mentioned your location, I don't remember where it is. A) You can rub all of the new buds off except for the most proximal one. This includes any buds trying to erupt in the axils of the leaves currently on the tree. These new buds have already differentiated, so there is an apical meristem churning out auxin. If you rub the buds off, lack of the hormone that suppresses lateral growth should allow new branches to form more proximal to the now conspicuous buds. Do this if you live in a warm, sunny place. B) You can give the tree its head, that is to say, let it grow unencumbered by pruning until late spring - mid-June in the N hemisphere or mid-Dec if you live S of the equator. Then cut it back again so there are 1 healthy leaf on each branch. It should back-bud near the bifurcation or even below it. In bonsai, these strategies are used to "chase the foliage back closer to the trunk", but they work equally well for your purpose.

Tip - after you have a good basic structure on which to build, never allow a branch to grow where it's not needed. As soon as a bud or new branch is noted, remove it asap. There is no sense in allowing the tree to expend on growth you know you're not going to keep, unless you advance enough to be able to use sacrifice branches to add to the planting's eye appeal.

Al

Indeed! i learnt a lot from you couldn’t thank enough. I will report back on the status soon, and oh I live in a warm and sunny place all year round.