If you are want longterm investment just invest your money to The altcoins and that amount of money is really big and it total of millions  to my country. You can try to invest it to the ethereum,  litecoin, riplle and bitcoin you can have other coins if you want remember the more coins you have the more profits you get. Mining is good but you have a lot of knowledge and you can know how does mining really works to avoid losing your capital or to bankrupt.