We are very busy. We cannot do everything. There are a lot to do. And, I don’t have time to do this for you.
I never say the last sentence. This is because you always have times for things that are important to you. If I say that to anyone, it means he/she is not important to me. The easiest solution is to add the word ‘now’. I don’t have time to do it for you now. Is tomorrow ok?
How about prioritisation? To prioritise, you need a clear goal. Will this thing move me closer to my goal? Which option is more likely to get me closer to my goal? What is the most impactful thing I could do to move closer to my goal? Without the clear goal, you just choose to do things base either on doing a favor to please people or just taking orders. You will be super busy but end up feeling achieving nothing.
In a professional life, you don’t come to work to please everyone or to be everything to everyone. It’s not possible. Setup a clear goal to add meaning to your career.