Greetings, Brother!
Walking in park is a very good idea. Try also working with stone. It collects not only sexual but emotional drive, all pain of lifetimes' loneliness into itself. Concentrate all pain of loneliness and passions in the world into the ball in your Sacral Chakra and circulate around the orbit. Then put the ball into higher Chakras such as 6th one or Pineal gland.
Sexual and love drive is given to us to teach us to treat others better and be better people. Through sufferings of eternal rejection and battles for the Dame's hand we learn a lot of things Nature wants us to learn. But there are spiritual people who already know these things and do not need to suffer and die numerous times to learn kindness and Knighthood. They are intuitively led to higher knowledge how to sublimate it into higher things than earthling battles for mortal love.
Lower Chakras are base of everything in the universe because observed universe is our consciousness, so Lower Chakras are base of consciousness. They are base of every experience and learning process. They can destroy us and make us humans, and then Gods. They are men in our countries and bulwark in our states who protect us and stand up for us to death. They are Hades part of Zeus in us that make us better and make us worthy of life. If we misuse their powers they also can make us monsters and put us to Tartarus because their energies turn into Tartarus when misused.
Not advancing them would only end up in them not becoming purer. Energies are still there, they will just stay gross. Instead a lot of cleansing put on them daily will make them pure and brilliant, purely platonic, Knightful, noble and royal, all ape aggression and other orc filth will be gone. This might include committing real feats too.
As for sucking energies out into higher Chakras see technic above. When blockages in main Chakra column are gone this is also amplified naturally. This is what is called "achieving Dame's hand" in legends - when the energies of Lower Chakras not stuck by blockages anymore naturally rise up and achieve Higher ones.