How to Compress a Large PDF file
There are a couple different methods to achieve this file compression.
A. Compress with Adobe online tool
1. Go to PDF compressor: Compress PDFs online for free | Adobe Acrobat

2. Click the
Select a filebutton above, or drag and drop files into the drop zone.
3. After uploading, Click Compress and Acrobat will automatically reduce the PDF size.

5. Download your compressed PDF file.
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B. Compress using licensed copy of Adobe Acrobat Pro
1. Open PDF in Acrobat DC.
2. From the File menu, select Save As Other > Reduced Size PDF.

3. Choose the location to save this file and select Save. Acrobat will display a message showing successful reduction in PDF size.
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C. Compress using FoxIt Pro
1. Open PDF in FoxIt Pro
2. Within Foxit PDF Editor, choose File > PDF Optimizer > Reduce File Size.

3. To apply the settings to the current file, choose Current File. A dialog box pops up. ... Select OK

4. Specify the file name and the location to save the optimized file in the pop-up dialog box. Then click Save to start the optimization.