Did some drills for holding on to side control. If the person you're on tries to burst and get a leg in, flatten out. Reach my arm around one of their legs in order to grab the foot of the leg they were trying to move under me. Hold on to their ankle while I reposition, basically by holding them down with my hips and sliding back off. Then ram knee back into their side to re-establish control.
Got arm-barred a lot while rolling. I'm trying to be a bit more aggressive, which is leaving me more open to attack. Got to take a risk in order to get anywhere though.