Happy New Year friend. It's okay to feel down if you feel you haven't made much in 2021, it's simply how life goes with distractions coming around at all time, whether they are urgent or not. However, if you want motivation to continue drawing, perhaps you should do something to make yourself happy, like enjoying some food you like, playing video games, watching funny or interesting videos, etc. Whatever happened in 2021 shouldn't be a big deal to feel bad or down about, instead mold it into a positive motivation to continue your work. I hope you enjoy the New Years Day and you're doing alright, you take care