I think Brian is correct about that dying shoot - bending has disrupted the sap flow and that one will almost surely die. Losing a branch may change the design but just move on, reassess and use others instead.
Yellow needles is quite common. Normally for me it is lack of fertiliser and quickly changes back when I remember to apply. I see you already have fert bags on the pot. What sort and how long have they been there, when replaced, etc?
Nutrient deficiency is not always straight lack of fert. Sometimes something is stopping the tree from absorbing or using the nutrients properly so it does not matter how much you apply. Need to find the cause. Poor roots is one cause. Try to lift the rootball out of the pot to inspect the roots. Check for healthy white root tips, soggy soil, etc. If the soil falls away from the roots there is a problem - Root prune and repot. Usually results from poor conditions - too dry, too wet, not enough light, poor mix. Try to work out what and make changes. Incorrect balance of nutrients can also lead to nutrient deficiency. Some home made recipes do not contain all the necessary elements so the tree is limited, not by what is there but by what is missing. Commercial ferts are designed to supply all that is needed.
Root bound is another reason for trees unable to absorb water and nutrients. Eventually the soil gets so packed with roots that water (and soluble fert) cannot penetrate even if you water and fertilise as well as you can. If root ball is solid, repot soon.
You can see there are many, sometimes conflicting, reasons for poor tree health. Without knowing background and seeing some aspects it is much harder to pinpoint a possible problem and solution.