how to make worms happy and active

Hey, I've been keeping red wigglers in totes for a while, and I find myself constantly overthinking the process and am sensitive to their experience. Right now, they seem to be dwelling at the bottom and not eating much at the top. They are also going through the holes at the bottom ( not all of them, some are active in the bin ) any simple advice on what to add to the bin to make them the most happy? I get overwhelmed with all the different advice on the Internet. Id just like to find a good flow on what to add and keep them happy, things to loom out for etc. Thanks so much