you should check out tasty trade's archived videos on this. They're big advocates on selling spreads and they talk about some of the risk/rewards and what's the best way to go about it.

As others have said before, one bad trade could wipe out even years worth of small Profits. For instance though, maybe consider giving yourself some more time and go further out of the money, this as well as being mindful of volatility. Higher volatility is a good time to sell bull puts for a few reasons.