'and it was a lot' emphasizes the fact that this person was undertaking a lot of work to ensure that the company did not lose one 'case of business'.
There was alot of work to do, and he or she was doing it.
'everything in my power' could actually be very little, depending on how much power this person has.
'case of business' refers to an opportunity to sell, yes.
'displays' could refer to anything that is advertising or displaying whatever the company is selling.
the 'consumer reach' is the potential number of consumers / customers that they could be hearing about their product.
Hope this helps!
Student or Learner