Quote from hlpsg:
There is a downside though, your profit on the upside is limited to the premium you collect. So if the underlying rallies more, you lose out on the extra gains.
If you want to mitigate this by selling deeper ITM puts, then the extrinsic time value you're hoping to make will get less and less.
If you plan to roll it month to month to take advantage of the greater time decay, things get complicated when you need to choose which strike to sell. And if you're at risk of getting exercised, then you either need to roll (which adds even more complexities) or to just be assigned the ETF.
I'm sure there's a smart way to do it, but it's not that straightforward.