How to clear server and browser cache in WordPress

I have a plugin that randomly displays images on the interface. It works well on a website without a cache, but for people using in siteground

or wpengine

, the same image is displayed instead of random. I tried to add a unique ID to each image like the code below, but it doesn't generate a unique ID in the server cache systems. Instead, the first generated ID is displayed each time with the same image.

<img src="image.png?v=<?php echo mt_rand( 1000, 9999 ); ?>" />

      

        
        
        
      

    

I also added below code for siteground

cache (SG Optimizer WP Plugin) but it still won't work:

if (function_exists('sg_cachepress_purge_cache')) {
    sg_cachepress_purge_cache();
}

      

        
        
        
      

    

Is there a solution to solve this problem? How can I show random image in all server cache websites.