Just pray and sleep well.
Learn Mental Skill Skills
The wise man said, it is impossible to return the time that has passed and do not worry about what will happen tomorrow, because you live in the present time.
If you are skilled at mastering your own mind, then you can give attention to what you are doing now and focus more on what you do.
Just like any other skill, mastering the mind takes practice and over time, it can help overthink.