Here are the steps that can help you to reduce the number of the files in the cache.
1. You can keep all the .human files and clean the rest or part of the cache.
2. To reduce the number of files in the cache folder you can disable the languages you don't want from the language selector and remove from your sitemap.txt.
3. If you have dynamic texts (dynamic date-times, counters etc.) in your pages try to wrap them with class="notranslate".
Also, you can use GTranslate Enterprise service, which is a translation delivery network and it will keep the cache in our cloud TDN. You can find more info at https://gtranslate.io/faq