That profit will increase over time and improve your return. 

A lot of investors find that expenses like repairs, vacancies, and capital improvements can eat into their margins, especially early on.

Get your CRM up and running and keep in contact with everyone with content about the market, keeping in touch with past clients - just asking them how their house is, let them know that you were thinking of them when you drove past the house,  ask them if they made any improvements, etc.

It’s worth reaching out to your lender to discuss the specifics and get a quote based on your improved property value.

I would use the income to slowly improve the house and once you get it to a good spot, HELOC out some money for a down payment on another place rinse and repeat. 

Since 2020 we've seen large asset value increases and large tax increases, and more modest insurance increases but we've been able to improve our profit margins sufficiently to keep up with inflation and even do a little better in many cases.

Basic staging with an agent usually means they give you insight into how you should:Declutter and depersonalize by removing photos and personal itemsArrange your furniture to improve the room’s flow and make it feel biggerAdd plants, move art, or re-arrange other accessoriesFull-service staging is another option if your house needs more hands-on attention.

The property manager should be involved before you buy any property to give input on due diligence, how to increase income and reduce expenses, and to make repairs or improvements to maximize occupancy.Excellent property management is critical to your success before, during, and when planning to sell or refinance.To your success!

Focus on optimizing the current fourplexes (improving rents, reducing expenses).

This would improve the property value and also allow you to lease out the 5th unit.