Traditional skills the age old method of doing things have been perfected by its useful usage from generation to generation. It links the past and the present in a rather scientific way.
I can`t get the first sentence. And that "useful usage" sounds really artificial to me. So, like a foreigner, I have no clue what you want to say... which is everything but an asset.
Second - I am not that familiar with IELTS essay structure, so let someone who`s more indulged correct me, but I think you have missed the whole point of the topic. It states really neat what you should do - agree or disagree. I can find your clear thesis in your last paragraph, but it has nothing to do with the subjected task. A good, stable and appropriate thesis statement should sound like that:
I am deeply assured that we must not betray our national heritage in its expressions of skills, crafts and folklore.And, provided with this as a base, you should start developing it and bolstering it with examples.
I can tell that you have good writing style and excellent vocabulary, so don`t shortchange yourself. Give more attention to essay structure.