My advice is a little different from the above poster.

With your high income from a low-effort (operationally) business, try to accumulate $2m cash in 5 years, and you will be much better off than 90% of the armchair critics here who have to literally slogged for that miserable $10k monthly income.

With lots of cash, things become easier. You can easily qualify for private banking (you're not UHNWI, but still a HNWI nonetheless; try approaching the smaller less-atas consumer banks), and you can get reasonable loans. Then buy 2-3 condos and rent out, and you'll become a "traditional" investor with truly "traditional" passive income. To "diversity", buy and hold some of the high-yielding blue chips like Starhub and you're all set.