At what level do I need to be to switch to another language without actively harming the first?

I'm progressing in my target language but already have plans for learning a second (third total) language.

I've been focusing solely on my target language because I know studying other languages, especially closely related languages (e.g. Spanish and Italian) before the other is fairly advanced can cause significant problems and confusion.

My question is, at what level can I switch to learning another language without seriously harming the progress I've made in the first? Is it around B2? C1?

Just curious.

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