Need advice on what to make my next move

[Troy Iversen]

Hi so I bought a 1 bedroom apartment in 2015 for 170k. It has gone up about 40k since I bought it and I have a tennant living in it. I put 22% down 15 year mortgage. Tennant is almost paying for the full amount of mortgage. I have about 80k saved up for my next deal. Should I sell my apartment and use that money plus what I have for a property with more units, or keep my apartment and just buy a second place with what I have saved? Thank you