Shipping companies & organizations, charities that take household items

Hi! First time poster here. I live in Washington, DC and need to clean out my parents’ apartment in Taipei. I am seeking recommendations for:

  1. Shipping companies that can ship boxes back to the States. I think that using the post office may not be economical as I will have too many boxes. On the other hand, I am not shipping a household full of items. The stuff that I will ship back most likely will be photo albums, books, etc. that have sentimental value.
  2. Organizations that take back all the other stuff that I will not be shipping back, which includes furniture and everyday household ware. Or, should I have a rummage sale?
    I will be coming to Taipei and have a short amount of time to get this done, so am looking for advice on how to accomplish this efficiently. Thank you in advance for any help!