Could you please tell me if you want to sort the repeater from the current post or all posts?
If you want to sort the repeater from the current post, please check this page: https://www.advancedcustomfields.com/resources/how-to-sorting-a-repeater-field/.
If you want to sort the repeater from all posts, please check this answer: https://support.advancedcustomfields.com/forums/topic/calendar-by-month-with-date-repeater/#post-41019. This page should give you more idea about it: https://www.advancedcustomfields.com/resources/querying-the-database-for-repeater-sub-field-values/.
I hope this helps 🙂
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