Many community colleges offer courses at a reasonable price and partner with local libraries or chambers of commerce to provide practice conversation sessions with native speakers. If you are already familiar with a language, you can level up your proficiency before applying for a job. The American Council on the Teaching of Foreign Languages (ACTFL) offers an assessment for those looking to obtain a professional level of language proficiency.
The best way to expand your language skills is to practice them as frequently as possible with native speakers in real-life conversations. Services like Lingbe and Speaky can provide this opportunity, but there may also be groups in your area that meet in person for language practice.