It's a tip I heard from someone which I heard increases the response rate. 

In Portland for example we are not allowed to increase rent more than once in 12 months, and it must be less than 10% increase in "effective rent".

page=LoadVirtualDoc&BookmarkID=6536) that capped annual increases to the Taxable Value of a property to the lower of 5% or Michigan's Cost of Living increase.

You can likely do this with your savings rate (that will likely increase) and age. 

Over time, rents may increase, improving your cash flow, and you’ll gain equity and valuable experience managing tenants and property operations.

Or can you acquire another business in an adjacent field that increases profitability?

This would greatly increase the size of your next downpayment.

This will increase the return above what can be obtained on a passive investment.The flipside of having the power to control everything is that it can be alot of work (and a full-time job if a person is putting in sweat equity).

Prices have increased (higher terms/rates) as the fed rate has gone up so you have seen people who could get 8 or 9% now in double digits.

There are two ways to do this decrease spending and increase income.