The safest investment for a year from now I think is Bitcoin. Bitcoin will have its halving event around May 2020 and it's an enough sign to know that the price will be growing and might have its new all-time high. Other's coins might follow Bitcoin and you can have higher return but you need to pay more attention of what you are going to invest in.
Aside the bitcoin halving which will occur at 23 May next year,I also believed Bitcoin is the best investment which would yield investors awesome profit within a year due to it potential and community support level but it will also be a wise decision if investors don't put all his eggs in one basket.