If you have not developed the ability to keep your mind fixed on God at all times you should do so by regularly practicing meditation. If you do not have the discipline to meditate regularly, you should practice dedicating all your actions to others. And if you can’t even do that consistently, practice giving up your attachment to any selfish gain from the fruits of your actions. Thus, you will be giving up your ego and surrendering to the will of God, taking refuge in Him. This is what the Bhagavad Gita calls performing your actions “like a mastered self.”