How to Focus and dedicated to the job,project or the things we currently work on ?

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i have trouble to focus at one thing, im afraid i will became "jack of all trades" who can do anything but not expertise them like the other
but i always got distraced by new thing and then proceed to learn that and abandon my previous work

i dont know if i considered by ADHD but i dont want to have that


thanks guys for whatever help you guys can bring here!!