The tech-heavy Nasdaq Composite is down 20% over the past 12 months, and that means there are great, beaten-down tech stocks out there that have the potential to bring investors significant gains in the coming years. If you've got $5,000 to invest right now -- and an investment horizon that you measure in years and not months -- splitting that cash between The Trade Desk (NASDAQ: TTD) and Roku (NASDAQ: ROKU) could be a smart move. Advertising companies haven't exactly been having a fantastic time as inflation has skyrocketed and a potential recession looms.