Here are some ways to see improvements in your drawing quality and productivity through inaction, not action. They’ve worked for me and may help you too.

• use less colours. It forces you to carefully consider your colour choices, not draw things just because you see them as a certain colour
  
• use less layers. Don’t waste time flipping between layers, just separate the essentials (line, colour, shadow…)
• don’t be pedantic about lineart. Most people don’t notice small blips in lineart, and unless you’re doing vector or professional art, the time trade-off isn’t worth it
• lower your stabilizer. Low levels are enough to assist with curves. Higher levels make sharp turns hard. Adjust to your comfort, but see how low you can go
• quit sooner. Spending excessive time on one drawing can be a bad habit. If you’re learning, you want to draw many different things, so quitting and moving on helps