I had the smae issue as you did looking for a passive income coin. The best one I could find is Neblio. Its ranked around #170 and its coin ticker is NEBL. It pays a massive 10% POS however not everyone stakes tso the inflation rate is around 6%. The great thing is there are only 14 million in the total supply.
Neblio is a work class blockchain geared towards enterprises that is tech wise every bit as good as the big market cap projects if not better. This is a true diamond in the rough. Current price is about $1.80. All time high $65.00.
My favorite part of this coin is calculate how much a month I will make if we ever go to 10% of the old highs. You can really move ahead if things play out right and your holding this coin.