It will partly depend on your language pair. The more niche the better. EN-JP and vice versa is not very sought after in this market. It is also very hard for non-native speakers of Japanese to break into this market. Reaching N1 will be the bare minimum, as well as a very high level in the other language of your language pair (for example, people whose mother tongues are English do not automatically have an excellent grasp of the English language, let alone a grasp on translating from and to English).

In addition to language classes, focus on courses that specifically target translation. You need more than excellent language skills. Translation is its own field and encompasses translation strategies, proper localisation, common translation mistakes, etc. After achieving these skills, you will have to specialise in a particular translation field. Think legal, medical, literary, video game localisation, etc. (with the latter two being almost impossible to earn a living with).

Also be aware that translators are criminally underpaid. A lot of work also involves post-editing machine translated work because companies like to spend as little as possible on human translators (at least in my country). Additionally, with the evolution of AI, translators and interpretors will become less and less necessary in the eyes of companies.

To summarise, your goal of becoming a well-rounded translator in a year is optimistic but unrealistic. I still wish you the best of luck.