A few things that come to mind from having worked in many coffees in a few countries where those were implemented would be to institute an off-peak/peak time po

A few things that come to mind from having worked in many coffees in a few countries where those were implemented would be to institute an off-peak/peak time policy where people are asked not to work during peak time (e.g. lunch), have some sort of subscription model which comes with a faster wifi and X drinks a month.