Make sure you tune your vocals so that they match the key of the song. This song is on A minor so always keep note. That violin sample really killed it for me. I'll be honest, it war hard to get back in the groove once I heard it. But nice beat though. You don't hear a lot of hip hop like songs in 3/4.
You've got the arranging part of song making down. That random violin sample is weird and kinda kills the vibe though. The vocal is nice. You just gotta stay experimenting with synths and effects so your stuff sounds professional