• Find music that compels you to dance, and then dance to it. Might release some inhibited stuff.
• If the risks seem outweighed by the benefits, you could try getting a little drunk.
• Learn to spot when you're repressing emotions. You might be very subtly, with great skill, suppressing emotions before they reach your conscious awareness and before they really gain steam. Are there pressures in your life or in your social world that make you repress emotions? Can you avoid or alleviate those, at least temporarily?
• Try hanging out with someone who you feel really comfortable with, and make common knowledge with them that you're going to be trying to feel your emotions strongly. People are social and emotions can sometimes be bigger when there are other people around.
• When you feel some emotion, do a bit of meditation on it. Give the emotion your full attention for a little while. Can you feel it, sensorily? Like a pressure in your head, a fluttering in your stomach, a softness on your back, etc. What does the emotion say if you let it speak? If you're feeling X, then what is so X-ish about the world? Like, if you're sad, what might you be sad about, and what exactly is so sad about what you're sad about? (Don't demand an answer from the emotion. But let the emotion use your brain to think of memories or facts that make you feel the emotion that you're feeling, and describe what's so X-ish about those memories or facts, and pay attention to the X-ish features and how X-ish they are.)

Exercise and stimulants tend to heighten positive emotions. They don’t generally heighten negative ones, but that’s probably all to the good, right? Increased social interaction, both in terms of time and in terms of emotional closeness, tends to heighten both positive and negative emotions.