$350K investment in real estate

[Addy Cash]

I bought a rental property(single-family house) in Oregon for $350K cash and placed it on rent for $1850 per month. I pay $185/month in HOA and $9000/year in property taxes. I had to make a quick decision with buying this property, due to a life event change at that time(divorce, 1031 exchange etc.). However, now that the dust from my life transitions has settled a bit, I am wondering if it is better if I invest my $350K in multiple properties (or at least more than one) instead of putting it all in one. This will mean I may have to take on a loan, though. I am new at investing. What do you experts think?

P.S. I have a full-time job and cannot spend much time managing the properties, looking for a passive investment scenario