If you know anything about duplex builders (most seem to be single family only?)

Single family, 2-4 unit? 

If you house hack a single family residence by renting out  a room or two then you would have no property tax but if you buy a duplex you might have to pro-rate the property tax.  

It’s a single family house that I bought for $160k.

Quote from @Reed Rickenbach: John - as long as you are still following strict screening criteria I agree for single family.

., "I will buy at least one single-family home, duplex, triplex, or fourplex before the end of 2019") and then do it.

We acquired 3 single family homes in 2023 and we are midway through a 6-unit deal for 2024 and looking to get more.

Focus on smaller single-family homes, condos with low HOA fees, or multi-family properties in these regions, and build a reliable local team of agents, property managers, and other professionals to ensure a smooth investing experience.

I currently own a 1 bed 1 bath single-family house as my primary residence.

However, not one general location is going to help you determine whether it's a good market for multi family or single family etc.The one true way to start looking into a market is talking to an agent who knows the area.