Pisces might need to get more practical in this subject...Selfless and spiritual, Pisces can be a little scattered when it comes to their career planning, due to the dreamy nature of their Neptune ruler.
Because this sign is ruled by the Water element and their symbol is the Fish, they like to go with the flow, and often find good results this way.
But why not use your intuition to pick a great investment? Making a 5-year plan doesn't have to be boring or stuffy. If you want to compose film scores, put that in the plan.
If you want to build wealth to learn painting in Florence, put that in the plan. Once you see what you want on paper, you're freer to manifest it.