I will still be earning from the mining that i did
Yes of course, investing in bitcoin a hundred percent is not really good. As you say bitcoin price is not stable thus it is really risky. If I have a good amount of bitcoin like you, I may exchange my bitcoins to cash and invest on buying stocks. I would also try to have savings account on a bank and buy some mutual funds. Continue to do the old way to earn with bitcoins like trading, investing, and posting.
I think I'll just invest and some for the mean time, and convert my it to money spend some for my self and if possible start my own business.
Who knows until when can we benefit from bitcoin. So for now I'll just take all that I can and spend later. Spending my bitcoin on investment to have more bitcoin, it was the basic learning i keep on my mind. Having bitcoins is not bad at all: easily use, no need bank management( state) or hassle free, also more potential earning. Sometimes we need to leave the bitcoin if we already have investment, you can't enjoy your money when you died.