A few tips Sir. And keep in mind, this is merely my way of playing Judo.
1. Don't grab with both hands. This eliminates your ability to punch.
2. Try and keep you oponent away from you. Just a small dm can be fatal.
3. The way I play is to get my opponent in a locked position. This is pretty much where they can't move crucial parts of the body to save themselves, such as arms or legs.
4. If you want to risk it, you can go in for small hits. I suggest not doing so, because your own knee could come off from a kick.
Thank you for your time. I hope it helped.