Getting longer stays

[Justin Melton]

My wife and I have owned an Airbnb since early March and are doing pretty well so far. We are in a small Midwest college town (MAC school) of about 60k people.  

We pay about $1700 for mortgage, insurance, utilities ect.   April was our first month and we did $2498 (our cut after airbnb fee).  May was $4200 because we had one 7 night and a 15 night stay!!  The month of June my parents stayed in the property from out of state (the whole reason we bought it)  July was $2200 (only 3 weeks mom and were here first week of July).  

So far in August we have $1800 booked (first 2 weekends) then a week stay from Wed-Wed The 21st-31st are current not booked. What is the best strategy to book these 10 days and longer stays like 7-14 days?  I have been offering weekly discount but thought of doing a special with a minimum stay for those dates.  Thoughts?  Our other long stays have been people in town for work (one was a staffing company manager and one worked on windmills) thanks in advance!