take what you need from this list and leave the rest.
Stand up and move while you self-pleasure.
Stretch while you self-pleasure.
Blindfold yourself.
Play with different breathing rhythms.
Play with your PC muscles and sphincters (eg. clench when inhaling, release when exhaling)
Take breaks when reaching high arousal/pleasure
Touch yourself with both hands.
Massage your body with one hand while you masturbate with the other.
Sound off when self-pleasuring
Handless masturbation (for example, with a Magic Wand tied/mounted to the corner of a table.)
Using porn? Turn off the video as soon as you are aroused.
Look at yourself in the mirror. Gaze into your eyes as your own lover.
Do you put on music/candles/scent?
Do you dance?