Hold is more safely and stable way to make profit but you can get more if you invest in some good alt, either way you decide you wanna risk and get more or just play safe
I think, that by the end of the year the price of ETH will exactly exceed 1k USD. If 2x is a profitable investment for you, you can try. If it is not enough, it is necessary to look narrowly at other altcoins which potentially can give the biggest profit.
I think by the end of the year it can easily reach 3k or even 4k if nothing really bed will happen