These innovative companies could juice your portfolio.Investing in the stock market and keeping a long-term perspective on the companies you invest in can help you build lasting wealth. The challenge is to know what companies are set up for explosive growth.To assist you in your search, three Motley Fool contributors recently examined Shopify (SHOP 0.97%), Lyft (LYFT 3.19%), and Roblox (RBLX -0.17%).Here's why these growth stocks are poised to deliver excellent returns in the coming years. Moving from e-com ...