Honestly bitcoin is the best thing to invest in at the moment. It's quite low and stable at the moment, and it's only a matter of time before there's newfound interest.
For me bitcoin is first and best choice investment for long time (more than 5 years). Besides bitcoin i also save some altcoin like etherium, monero, dash and doge. The precentage is 70% for bitcoin and 30% for altcoin.
Primarily people here are investing into bitcoins after that to grow their bitcoins they are planning up and searching for other opportunities. I believe that you are up to one stage as of now. Holding and saving bitcoin must be safest investment. Next stage would be high risk involved and needs careful analysis to find out an opportunity. Personally, I too want to stay within stage one itself.