Work out what is distracting you.
If it is your own mind distracting you, then give yourself 10 minutes to do a task that are avoiding, and reward yourself afterwards. The reward should be small, but something you only do after you've finished the task.
If it is what others are saying that distracts you, then go back to the headphones and this time listen to Brown Noise loud enough that it wipes out what people are saying around you.
If it is email/chat/socials that are distracting you, then close all programs except for those that you need to do your job. If you have to have email open, set email rules to pull out the emails important for your job, and store the non-critical emails in a separate location so you don't worry about them.
I personally find that headphones help a lot, but for me I must listen to either Brown Noise (or white, or blue, or whatever is best for you) sounds, or listen to music that has no words and has no beat. Words in music distract me, and any beat in music also distracts. I've also found if I can't understand the language that singers are singing, that is less distracting, so Benedictine Monks is fine.