Translation:Cultural tourism is also very important.
In English, we don't need to write 'The' to start this sentence. We would however need 'The' if 'industry' or 'sector' came after cultural tourism.
I have been an English speaker all my life and an English teacher for many years and I see nothing wrong with using "The" to start this sentence.
In English, when we want to refer to something in a general sense, we don't use an article.
If someone does uses an article in such a case, it's a dead giveaway that they're a non-native speaker. So if you want to sound like a native speaker, this is one trick that will go a long way.