The online lending marketplace still has a bright future.Upstart's (UPST -3.82%) stock more than doubled over the past 12 months. The online lending marketplace, which had fallen out of favor as interest rates rose in 2022 and 2023, became more attractive as the Federal Reserve finally reined in rates again.But even after that impressive rally, Upstart's stock still trades more than 80% below its all-time high from October 2021. Let's check out four reasons it's worth accumulating before it posts its fourth ...