If the followers are genuine and actively engage with your content, there may be opportunities. The biggest question is whether the account follows the platform's rules and whether the audience is there because they enjoy your content.
If it's a parody or meme-style account, you could continue growing it and eventually work with brands that fit that type of audience. Just avoid misleading people.
If the account was created just for fun and unexpectedly grew, that's actually a good problem to have. Think about what your followers enjoy and create more of that.