Update post meta – Custom field does not match meta-key

Arrays are serialized by default, so just do

update_post_meta($my_post, 'ganalytics_settings', $ganalytics_settings);

https://codex.wordpress.org/Function_Reference/update_post_meta

$meta_value (mixed) (required) The new value of the custom field. A
passed array will be serialized into a string.(this should be raw as
opposed to sanitized for database queries) Default: None

Also, make sure that $my_post is post ID, not the post object.

And, if you want to update ACF field, you should use it’s update_field function.

https://www.advancedcustomfields.com/resources/update_field/

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