The OP doesn't have got that long time, all he's got is just 2 months 7 days, I think it's just 3 weeks from now. And right now bitcoin price is dropping, just saving it won't work for such short term.
I think trading with 3 bitcoins can really work for him and its better option then simply saving them as it will not increase the number count of coins in his wallet.
and he can make a good profit with that 3 bitcoin in 2 month, and keep the rest of bitcoin for himself. i think its a good idea, but the OP should know much about trading so he can make a good profit.