How many things can a person reasonably accomplish on a given day? How many unfinished tasks should I commit to daily?

Idalina Q.
That depends on not only your mindset towards each task but also how long each task takes. Start by slowly adding tasks until they become habit, then you may find yourself with a better mindset and more time. You can only do as much as you allow yoirself to do. So don't hold yourself back by procrastinating and get things done as soon as possible. Good luck.