Your best investment is true education; learn how central banks create the biggest scam in the history of mankind, how you have been funding wars the past 100 years, and finally how to get out and exit all these lies and manipulation.
Twenty years ago in 1997, the rupiah was 2000 to 1 USD. In 1998, during the financial crisis, it went down 5 times to 10000 (ten thousand!). IMF came gave strict loans so that big corporations are able to gobble buy up everything five times lower then original price. Money is a system of control. USA controls IMF and IMF controlled your rupiah. And rupiah controlled you since you have to work to get rupiah.