The best way to learn the multifamily market is to purchase a multifamily property.

In Collin County, consider properties with strong appreciation potential in areas like Plano or Frisco.

Quote from @Mo Suleiman: hello everyone I am a new member with one investment property so far and also a realtor!

Cleveland is a great market if you know how to navigate it and have a good property manager.

For (2), as properties age the rents you command decrease. 

For instance, the term could be 3 years and add a clause that says they have to return the property to the condition it was in when they moved in, not just keep their deposit. 

I get it...I get emotional with properties and buy into the sunk cost fallacy too.

@Jerry Velezif a property is owned outright with no mortgages, debts or liens on it, then it can (potentially) be purchased on seller financing. 

Since rental losses are typically passive, the best way to offset W-2 income is through Real Estate Professional Status (REPS) (750+ hours) or Short-Term Rentals (STRs) (100+ hours and more time than anyone else managing the property), which allow real estate losses, including depreciation, to offset active income.A cost segregation study accelerates depreciation, generating large upfront deductions.

One thing you might do is sell your more expensive properties and buy less expensive ones.