My tree is kept on the north side of my house and gets sunlight for about 70% of the daylight hours here. It is watered as needed, not on a schedule. The put it went into now has a single drain hole instead of two which the last pot had. All this is leading me to think that it may be suffering from tip blight, but I don't want to just start chopping branches and further endanger my tree.
Some pictures:

This was last spring. Not a great view of where it sits, but that is its normal home location. The pot in the background is also the pot that it is in now.


I brought it inside just for these pictures. It is in the same location outside as last year. You can see how the tree has faded some in general, and that the browning is located neard the tips at the top mostly.
Thank you in advance to any advice you may be able to give. I'm still quite new to this.