I've been training in Aikido for perhaps say 16 years.
you realized that there are punches that you can't do a technique on (for example a crisp jab)
You've been training Aikido for 16 years, and you never learned jab defense? Put up a flat, opposite hand and grip the fist when it touches the palm. Simultaneously grab the wrist with the same-side hand and with uke's fist and elbow in a vertical "tenchi," drop it straight to the ground with your center. Nikkyo and kote gaeshi become readily available, among others.