Jaw troubles..

It's been recently confirmed by my dentist that I grind my teeth when I sleep, I'm not really surprised at all as I've been experiencing jaw and tooth issues for awhile now. I'm planning on getting a mouthguard soon to reduce the damage being done to my teeth

Is there any at-home method I could do to reduce jaw tightness? It cracks a lot to the point where I fear that somethings going to pop out or hurt one day and it really freaks me out lol