If not you, who? If not now, when?
This quote is credited to a first century Jewish scholar Hillel.
It is brilliant enough to have survived two thousand years.
When you are procrastinating about something, and wanting to push the thing in need of doing into the future, stop.
Handle this now, and don't push it further. It will only eat your energies, even if you aren't actively thinking about it. Undone things are still in your subconscious mind, adding to the stress of an already busy life.
Are you the only one who can do it? If not, can and should it be done by someone else? If so, is it possible to delegate the task? Yes? Talk to them and ask. Or suggest it to someone who can then delegate the task further.
If only you can do the task, but don't do it now, take your calendar and write a day when you return to the matter. And then return to it. Take fifteen minutes to plan how to do it. And then write the necessary steps in time slots in your calendar.
Planning how to do the thing in itself releases stress. Clearly planned dates and times when you return to the matter makes you feel organised, and planning how to approach the matter in smaller steps makes you see even big things are doable.
Planning is the key.