Upgrades or repairs that can generate higher rental income

[Carlos Acosta]

Whats up bigger pockets. I recently purchased my first 2-family unit(side by side duplexes). I wanted to get some pointers on what are the best and most economic upgrades that can generate better rental income? This home is fairly new(mid 90’s). Each unit has 3bds, 1.5 bathroom, parking 4 spaces(2 for each unit). Any information, thoughts and pointers would be highly appreciated.