Hello Misael, I would do a thorough market research to verify that you can get the rent increase you want, you might find out that the market is oversaturated with rentals.If you are trying to raise the rent $100/mo, 1 month of vacancy ruins your rent increase for the whole year.I would list the property for lease 45 days before your tenant's lease expires, if you have your property priced right you should get some applicants before your lady moves out.

I am an agent so it was simple to negotiate after being on the market for a while.

Purchase price: $300,000 Cash invested: $65,000 Sale price: $455,000 This house needed a full renovation to compete in the challenging Austin, TX housing market.

Airbnb- house go off the market for housing.  

I have sold one in 40 days and others are on the market. 

Does anyone have a software or method of getting deals that have been on market 180+ days?

Wondering if there would be an opportunity to do Section 8 housing there if properties are cheap and market rent is high enough.

Make sure you dig into the podcasts, books, webinars, YouTube videos and finally a local meet-up to network in person locaclly. 

Are they only in Houston, or other markets, too?

Obviously if you can do the BRRRR method do it, but that is a lot easier said then done, especially in certain markets.