Bandwidth Limiter

I just hooked up my system the other day so I am new here. I like I can pause devices, see where bandwidth is going and everything, but I'm not planning on scheduled time slots.  I  was really hoping for better bandwidth control,  so our son quits hogging the internet.  We knew he used a lot, but we didn't really know how much until we got the eero system.  My wife has been working from home since March, and our top speed DSL is 16mbps very slow. I've noticed my gets anywhere from 80% and above and I can't cut that down besides pausing it. By the way this internet is the only internet available here.  We already have satellite internet only for backup, and it's expensive and sucks. PLEASE HELP.