Becoming a millionaire is a journey fellow freetrader! Is not gonna happen over night unless you have already a considerable capital (or you are firm believer of the GME frenzy craziness)
Be patient and consistently invest every month (only an amount you fell comfortable with). The journey to FIRE is long and you got to start somewhere, 3 shares in Nio are better than 0. To answer your question, you can keep adding shares to your holding in Nio (if you think will do well in the future), sell (if you believe it will not do well in the future) or just hold (if you are happy with 3 shares or unsure)
I am not massively invested in the company but I got in early and I believe in the fundamentals. I will keep adding on the dip but DYOR.
