/var partition almost full, help

My /var partition is 9.7G total space. When I had my server almost 5 months ago, only 500mb was used. Now, it's 90% full; almost 9Gb. /var partition almost full, help How do I clean it up, which files are safe to delete? I had no idea it'll use this much space. Any help will be appreciated.

 

 

 

 

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