I'm the guy who opens 12 tabs on my computer, trying to write, code, edit, read, and create content at the same time.
Do I make progress? A few times.
But the overall result is that multitasking, as I think, is a whole death pot waiting for anyone who indulges in it.
I believe that multitasking is a funny way of saying "I'm too lazy to face this content creation for 2 hours, so I'm just going to open up 12 other stupid apps and keep myself busy, try and kill 2 birds with one stone."
You are not gonna believe me firsthand, so let's talk about its effects.
Brown Health University defined the disadvantages of multitasking explicitly when it said that "multitasking makes us more distractible and prone to errors. For example, individuals rated as high media multitaskers (numbers of hours using multiple devices simultaneously, such as watching TV while also using a smartphone or tablet) showed poorer attention on cognitive tasks."
You can discard this as second-hand information, to deter yourself from the reality that this could be the one reason why you suck at getting a job done excellently with perfection.
The chances that you'd mix up your sentences while writing a speech, or run into errors while coding, or do something entirely wrong are high, but you may not know it.
While writing one book, I could remember writing a whole chapter of that book in an entirely different manner instead of writing on the topic of the chapter, all because I was multitasking and had read the abstract concept somewhere else, and started writing it in this new book, only to realize later on that I had made a huge mistake. For real, this could jeopardize your job, your business, or your entire career, and no one will know that it isn't your fault.
Talk about the health effects of multitasking like increased blood pressure, and stress which could have negative effects on the brain. These are backed up by researched data.
So how do you fix the issue?
The first step is to eliminate the non-essentials of your life. If it means you stop hanging out for four hours during weekends, cut it down to one hour.
The second step is to outline what you have to do and just get to work. Finish up the hardest task, move to the next, and don't stop until you have done everything you need to do.
I know you are looking for tricks, but there aren't any tricks.
If you work a 9-5 then, find figure out the most important tasks, and finish them early in the morning and on time - don't wait till the deadline is close.
If there's anything worse than cancer, that's multitasking.