Some books that could help: Brian Tracy - Eat that frog! Brian Tracy - No excuses! if you prefer a tldr: Self discipline is the key. Identify your long term

Some books that could help: Brian Tracy - Eat that frog! Brian Tracy - No excuses! if you prefer a tldr: Self discipline is the key. Identify your long term targets and do one thing at a time until it is finished. Work on what you need to finish even when you don't feel like working.