Thank you for all your tips and suggestions. I don't really know anything about DI, preamps and so on. My son-in-law and I were watching a really amateur group outdooors last Saturday and I was struck by the high energy of the bass even though the girl playing the instrument was no better player than I. But she obtained that lovely visceral sound when you hear a bass being played through an amp.
Do you have the same kind of bass and amp as her? Or a different kind of bass, and no amp? Do you have a teacher? How many lessons have you had so far? Are you imitating/copying bass lines by famous players?
I agree with the "you do not need a DI" crowd. Your Scarlett interface is designed for recording instruments like guitars and basses. Purchasing another DI would be like buying a second knife to chop your vegetables into pieces, before you chop the veggies some more with the knife you already own.