I assume your team is the developer pool for the company. If not, my comment is not usable.
Learn to use the forces piling onto you to achieve. If Bob in accounting is the client for whatever you are currently working on and Jim in sales asks for something, forward the request for pushing back Bob's feature to Bob. Then watch Bob and Jim wrestle on your behest.
Why does this work? Because people unconsciously know you are a finite resource. You are not tasked to choose what the company's priorities are, so let management choose the priority of each request.
Oh, and ALWAYS make an estimate of the work needed for development include the testing and some meetings. Meetings are like gravity: you can't escape them all the time.