A spell isn't what I'd say you're really looking for when wanting to enhance psychic abilities.
To begin with, divination is not typically better done using spells.
I would suggest you research the abilities you're trying to enhance and find more effective methods of refining the skills.
Beyond that I suggest you center yourself, practice grounding, balance your chakras, and learn to meditate for extended periods of time.
This will help your focus and capacity to create the necessary links when attempting to better yourself psychically.