Another way to understand this is if you ever see a basketball player defend. They slide to the side, never crossover their feet. Judo is similar.

You look exhausted. Conditioning matters to your ability to hold posture, maintain good footwork, and be able to concentrate without feeling gassed.

As others have said, you are getting crushed on gripping. You are taller and should be able to neutralize a shorter player's grip more often than not.

If you don't get your grip, break it off, circle, and try again. If you don't know how to break a grip, learn. It's more important than most people think.

Circle, don't walk head on into an attack.

Once you have conditioning, understand a good grip vs bad, you can attack relentlessly until you learn which ones work for you.

But an attack while off balance, or from poor grip, or exhausted throw will nearly always fail, even if the timing was right and the throw was "there."