The more you lose yourself in something bigger than yourself, the more energy you will have. This is because you won’t have the time to get bogged down in your emotional difficulties.
Find something that interests and motivates you.
It doesn’t matter what it is, as long as you throw yourself into it.
Go away to a place of rest to renew your energy.
Sometimes, it may be difficult to find anything that interests or motivates you. If this is the case, a restful break from life will fix that problem for you. Go to a cabin in the mountains or a beach retreat for a few weeks or months, and the positive impact on your inner energy will be tremendous.
Take care of your body.
Eat well, exercise, get sufficient sleep, and refrain from abusing your body, and you will find that you have the energy to pursue your convictions.