I don't know you so would be very difficult to make suggestions. I can only tell you what helps me get my mind into an organized & productive state.
Vitamin B Complex as needed for focus -- it is water soluble so overdosing wouldn't be a risk. It does turn pee neon yellow.
Drink water to stay hydrated & avoid caffeine. Drinking coffee or tea frequently only gives me nervous energy, not quality energy for productive thinking. I have a lot of anxiety. Caffeine doesn't help my mind focus.
I say the phrase, "Just do it, don't hesitate." Then I get to work on the first thing that comes to mind. I try to do the easy things first, & switch off into something more difficult -- but only work on the difficult tasks a little bit at a time. For example, I had a PHP project that I was not coding very well. It helped if I just coded a small portion, switched to something easier, then once that was done, switch back to the PHP & code a little more. I don't normally like to multi-task. Though, it wasn't really multi-tasking. It is the same for watching a long movie or several episodes of a show. I need a break from the stimulus, even when it is enjoyable. Don't know why, but have to pause all forms of entertainment every 15-20 mins to rest my brain. It becomes too much.
Hope that post was helpful.