How to help myself focus on a single task?

Hello everyone, I am currently working on a project that can only be worked on by one person. On any given day, I will have 4-10 tasks and I find it really hard to focus on one task at once. I know I need to focus on one task at a time, but I have an extremely hard time doing this. I do not want to juggle tasks, but I find myself doing this anyway. I will be working on this projects for at least the next 6 months, and I have been working on it for 2 months. Has anyone gone through a similar process? How can I train myself to focus on one task at a time and not juggle? I am looking to fight the urge to juggle tasks and focus on one task at a time.