I prefer long-term investments. I tried short-term investments, but I did not succeed, so I focused on long-term investments. 
I think there is a reasonable investment structure is still very necessary to avoid risks and increase revenue, short-term investment is to keep their working conditions and the momentum of progress
your investment into short term and long term, that is because both are profitable but setting a long term goal should have a specific target, otherwise
you are putting your investment in a big risk.