Goals can be achieved through discipline and sacrifices. If you find that you spend too much time and effort on a certain project, maybe you can’t afford to slow down and enjoy life. Like for example, being in medical school or something tough like that, you would have some sleepless nights to get things done.
If your goals are too intense and you lose quality of life, maybe change your goals or at least modify it to make life more bearable.

You want to limit distractions? Just cut the unnecessary stuff out of your life or at least limit the time you spent on it. For example, you stop coming to this website by logging off. It takes more and conscious efforts to log back in, then you’re less likely to log in. If you absolutely need to have some distractions as a form of entertainment, severely limit your time wasted to say, like 1hr a day.

Some people can achieve their goals while maintaining a lifestyle by balancing and managing what they do. You’d have to allocate enough time into your project, while managing the little down time you have to do what you want.

I wish I knew. I’ve never managed it well.