The one thing I always try to remember when on the ground is to stay calm, patient and aware. When I first started I would just constantly try to explode or use power. Now as much as possible I take my time and if I find myself in a bad position I try to stay there during practice so I can get used to it!
I always prioritise working from bad positions because those are where you want to be comfortable and calm as possible! The more you panic you will eventually give a small opening and in a game like this a small opening can be game over. I don’t care if I get tapped in practice. That is what practice is for. Learn, get better and never lose that enthusiasm!