through supplements, certain supplements like Nascent Iodine will protect your pineal gland from fluoride. Other powerful supplements include Blue Skate Liver Oil, or Phenibut, Oleamide, Melatonin, L-Theanine, or even Ayahuasca if permissible.
through gazing, such as sun gazing, especially during the sunrise and sunset. Star gazing is also powerful, you can also gaze at physical eyes, wether it be yourself or another being, see yourself in the reflection.
through use of mind-altering substances, such as blue lotus tea, medicinal herbs, or other substances 1 of which is known as DMT (Dimethyltryptamine) which can be released naturally in the brain by the pineal gland in deep states of meditation.