If you are still in school, choose at least one language subject because you can then keep that door open rather than lose the option of having languages in your CV. In higher or further education pick languages as your subjects, or at least pick languages modules for the same reason.
If you are considering teaching, ensure you are fully qualified to teach. Being unqualified will pose issues such as not being considered for positions or not being paid the qualified rate.
Whatever your chosen career is, language skills will be an advantage. Having language skills will give you options - it is better to have those options than not to have them.
Listen to advice from some industry experts here.
If you studied languages, consider getting qualified in a related area. For example, acquire a business, technical or teaching qualification to go with your languages degree in order to build a very strong skill set.
If your language skills are rusty you will need to upskill your language proficiency. You can do this with a course or on your own, find ways to practice your language proficiency skills and use on-line aids.
If you need a further qualification, for example if you are interested in international business or tourism consider adding it to your CV.