We have a very short answer from Gurudeva today to the question "What is the best way to increase shakti in our life? Is it by celibacy, pranayama, meditation, mantra....?" Gurudeva answers, "All of the above." But he adds that mantra and sadhana only work for the committed Hindu person.
The question from our cybersapce cadet is, "What is the quickest way to bring shakti into one's life and build it up? Is it through celibacy, pranayama, meditation, mantram?"
Well ... all of the above.
Pranayama will work for everyone. Celibacy will work for everyone. Mantram and sadhana only really works for the truly committed Hindu person.