The simplest is to re-save your file as a reduced-size PDF. In the latest version of Adobe Acrobat, open the PDF you wish to re-save as a smaller file, choose File, Save as Other, and then Reduced Size PDF. You’ll be prompted to select the version compatibility you need and then you can click OK to save.
How do I reduce the size of a PDF?
One-click option to reduce the PDF file size Open a PDF in Acrobat. Choose File > Reduce File Size or Compress PDF.