Is really that simple for 20% return?

I am not looking for lofty returns. Lately, I wrote a whole bunch weekly CSP at very low delta 0.2. Still, there is 0.5% premium on solid companies. For instance, yesterday, I sold NVDA @ 185 for $1 expiring this week. Or DELL, @ 117, for $1. I know sometimes, I would get assigned and loss but overall, can I expect about 20% annual return? TBH, I would be happy with a safe 15% return. I also sold 30-45 day options. Any suggestions for a safe and consistent option strategy?