If you were able to keep them securely till today, keep them for some more years to make the most out of it. Bitcoin price is still not seen its peek yet and there is a lot of potential to go even higher than you probably have anticipated. So it is better to keep them for some more time.

You can also cash out a minor portion of your bitcoins to invest in a real life business which you would like to start. Else you can start with online trading with that amount of bitcoin. Once you have the knowledge about trading, you will be able to multiply your bitcoin within a very short period of time.