Doing things mindlessly means the things you are doing are pointless. Whatever value you may gain for any endeavour has to happen while you are in the right state of mind.
If there’s a cornerstone to self improvement and productivity, its mindfulness. It allows your mind to reach a state, where other improvements can finally be brought into focus. Without addressing it, you’ll always feel like there’s something missing. You might be consistent in your habits, and reach some of your goals, but the overall structure of your day, your life, won’t quite seem to be in harmony. Mindfulness practice addresses that, by first making you see the fog of busyness, and distraction which permeates our lives. Everyone wants to have more time to get more things done, but productivity alone isn’t the answer you seek. Its not about getting more done, its about getting what’s important done.
Like all things, it takes time to undo the effects and you’ll have to work at.
If you don’t know where to start with mindfulness practice, try something like Calm