Other most common factor: Family Size increases due to marriage or having a child. 

It's tempting early on to leverage as much as you can so you can do more deals and keep liquidity, but increased cashflow especially with PMI will make you sleep a lot better at night.

@Tayvion Payton here's some useful info:Recommend you first figure out the property Class you want to invest in, THEN figure out the corresponding location to invest in.Property Class will typically dictate the Class of tenant you get, which greatly IMPACTS rental income stability and property maintenance/damage by tenants.If you apply Class A assumptions to a Class B or C purchase, your expectations won’t be met and it may be a financial disaster.If you buy/renovate a property in Class D area to Class A standards, what quality of tenant will you get?

Increase your earnings, reduce expenses, save up, and invest.

- You or the PMC can get 3 bids, but who is going to know how to accurately compare them and understand if something is missing - that will require more work+charges once the project has started (a standard tactic by many contractors!)?

It will actually be more difficult for your agent to procure a buyer off market - so the work actually increases. 

Or try the reverse - rehab a property in a Class D Neighborhood to Class A standards and see what Class of tenant you'll get.

They further out the ripples go from the stone, the less appreciation your receive while the cash flow increases.

If you can get your Vantage Score up 50 points, you will see positive results on the mortgage scores as well, it just may be 30 or 40 points or could be 60 to 80 point increase vs Vantage increase of 50 points. 

Find the best local real estate investor meetups that have no pitches and you will increase your knowledge, camaraderie, and motivation ten-fold.