I will be lucky person if i have 13 bitcoin but my advise to those who have this much bitcoin to use these in multi projects and utilize this for future like in these days gold is also good buy some gold and keep it with you and some convert into other coins many new ICO are in the market invest in that decide to make a portfolio for good profit and hire some online services for earning too now a days every thing is available on internet and we can use this technology to go ahead in life.