US Citizen living in Singapore - what investment vehicles are recommended?

As a US citizen I have found investing options in Singapore to be rather limited, the banks I use will not allow me to invest outside of fixed deposits. So far I only use Stashaway - what are some good alternative investment vehicles that I may be able to access? My other alternative is to transfer my funds to the US and invest there, but I would prefer to keep my Asia earnings in Asia. My risk tolerance is medium to high - looking for a 7-8% annual yield.