when you want to release tension after a musical climaz, you do the opposite of what you were doing to build tension.
If you were playing a lot of non-chord or dissonant notes, you release the tension by landing hard on a key chord tone.
If you were playing a lot of short, choppy phrases, you release the tension by shifting to a legato phrase with a lot of long notes
If you built to a loud climax, you release the tension by bringing it down to a softer volume level.