Rookie seeking advise

[Robert Dudley]

I am new here, it seems like a lot of smart folks here. I purchased 3 single family homes in a cheaper area than where I sold my home using a 1031 property exchange. It has been 4 years now and all three have gained good equity, approximately 100,000 ea. Each property basically pays for itself with a small amount profit each month. How can I make these work for me to acquire a multi- family unit with out selling any ? Thanks in advance Robert