You know I am not a fan of multitasking. Actually it is a killer in terms of productivity and time management, so hopefully by now you are now a one task at a time operator.
But we need take this one step further. Even when working on only one task we can be unconsciously expecting our brain to multitask.
Consider the elements of each task or project. Is there similarity between them? If so, that’s great. If not then perhaps you could try a different approach.
Break your tasks down to small pieces then cluster these activities together into similar types of work. For example, phone calls, filing, organizing notes, scheduling meetings, typing, formatting, editing etc then arrange to work on each cluster in turn.
The benefits of doing this are that your brain gets into the groove and operates at a more productive level now that it doesn’t have to switch gears repeatedly.