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Have you tried using a plugin, for example https://www.ads-software.com/plugins/wp-pagenavi/ ?

yeap, it worked for the theme i was using previously, but it doesn’t seem to work for this one…

Here is a helpful article explaining how you can add pagination and replace “Older Posts” without a plugin https://design.sparklette.net/teaches/how-to-add-wordpress-pagination-without-a-plugin/
Hope this help!

thx!! =)