Enlist the help of a tutor by either paying for one or finding a volunteer. A tutor is a good choice because you are the only student. In other words, you get one-on-one help with Spanish.
Enroll in an online course. Some require payment and some are free. The benefit of an online course is that you can access the course with only a computer. In addition, you don't need to travel to a brick and mortar location. An online course will also allow you to learn at your own pace.
Listen to Spanish music, and watch Spanish TV or Spanish movies. This will not only help increase your vocabulary but also give you an "ear" for the nuances of the language. Increasing your Spanish vocabulary includes making it sound as authentic as possible.
Carry flashcards with you to practice the language. Write English on one side and Spanish on the other. Use them while you wait at the doctor's office or ride the train.
Practice speaking the language as often as possible in an environment where it is required or appropriate. In addition, practice talking to yourself with Spanish when nobody is around. By practicing the language aloud, you can increase your Spanish vocabulary.