The next step. Fluency
You don't need to pay to become fluent in Spanish. You don't need to buy a course. There are many free Spanish language resources, such as
Spanish Sentences, or the most common words in
spoken spanish on Surface languages.
I used to recommend Spanish courses, but there is so much free content for learning Spanish that I really don't think you need to buy anything more than a Teach yourself Spanish book, and then search use the internet ...
Besos.
Moonface