Best way to learn Spanish?

So I’d like to learn Spanish. I took it in school for 4 years but I had no interest in it when I was young so didn’t retain much. I have a decent base from working with Spanish speakers. I speak poquito Spanish. Just a little bit but I’d like to fully learn it. I just downloaded duolingo. Does anyone have an my suggestions on the best ways to learn? Maybe there’s a better app than duolingo or something. Just looking for ideas. Thanks in advance!