[header] How to refuel your mana [title] Go outside. [step] This will remove any technological distractions and connect you to the earth. If you cannot, that is fine as well, it will just be significantly harder to harness energy (patios and porches are fine). 
The time of the day when you feel the most magic will make for the best results. Alternatively, undergrounds places such as caves (or even for a lack of natural caves, deserted underground areas) feel better and more effective to some people.