Northern Ontario Grappling Championships competition footage and question

I competed in our local BJJ tournament today, going 1-1 in the Men's Blue Belt Absolute division. In my first match I drew a former two-time provincial university wrestling champion, and current head coach of the wrestling team where the tournament was held. As you'll see in the video, I have trouble creating opportunities from my guard against his tight posture and combination of stacking / hip control. I also fail to finish some Electric Chairs, and didn't really want to get crushed from Dogfight. In retrospect, I should have gone for the 50 sweep, or maybe just taken the omoplata from guard to get things moving.

I should mention that all leg locks other than a straight ankle lock from DOA were illegal.

What do you do against someone much bigger than you, with a top-notch wrestling background, if you can't get a sub off of your back?

Let me know what you think. Any criticism is welcome!

https://www.youtube.com/watch?v=Q_915xCqkeo

My second match went much more smoothly. Again, please fire away with criticism, comments, suggestions. https://www.youtube.com/watch?v=78cRedvnxm0

Nice one mate! I must say if his accolades are as you've said, you did well for a blue belt. At 2:55, I see you had meathook there and was battling his free hand. I would've stuck my hand from underneath that free hand like the zombie, only this time its zombie on the wrong side. Then, I'll use my forearm to frame his bicep and begin to sneak the knee of my free leg in just to get the pyramid. You can then proceed to other options from there.

Thanks for watching, Ladi! I know exactly what you mean, and I honestly can't remember if that crossed my mind or not, but that would have been a good option. I really appreciate your feedback :)