Combine 2 arrays in a query parameter

This does not work because this is not how you merge two arrays:

'post__not_in' => get_upsell_ids(), [get_the_ID()]

Instead you need to take those 2 arrays and combine them using array_merge, a standard PHP function:

https://www.php.net/manual/en/function.array-merge.php

Note that __not_in type parameters have a very high performance cost and do not scale, this query will be very slow and require caching.

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