Correction of imbalances
Regular practice of the various asanas and vinyasas is the best remedy I’ve found for this imbalanced state, due to their twofold effect of lengthening and opening the body. As an added bonus, many of your submissions will also improve. Consider that many of the finishes in jiu-jitsu require an exaggerated expansion out from the center (Think of a straight armbar for example -you arch your back and drive your hips forwards to apply leverage). Very often your effectiveness with these movements is hampered by the imbalances mentioned previously, and you can see how addressing them with yoga will allow you to generate more power.