We first prove that a left Novikov algebra N is right nilpotent if and only if it is solvable. Then we show that, every Novikov algebra that can be represented as the sum of two solvable subalgebras is itself solvable, moreover, if the two solvable subalgebras are abelian, then the whole algebra is metabelian. Finally, we show that for every n≥2, every n-generated non-abelian free solvable (or non-abelian free right nilpotent) Novikov algebra has wild automorphisms.
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Shestakov et al. (2020) studied this question.