I know the feeling. You prepare a big todo list for the next day, with tasks being sorted by priority (High, Medium, Low). At the end of the day, you completed the 3 items that were High. And the project is almost the same: tons of Medium and Low tasks. You feel bad, you feel like you did not accomplish much.
Get comfortable with only completing the most important tasks! Because if you decided they were a High priority, then having completed them all is a big win! And all those Medium and Low tasks can be done later, or never! Unless they become a High priority themselves.
Remember something: a Low priority task might disappear by itself overtime because it isn’t necessary anymore