The solution you used seems correct. But if you still want to know alternatives, here it is:
$varname = get_post_meta($post_id, 'fieldname', true);
echo $varname;
$varname will be an array if the last parameter is false and will be the value of metadata field if the last parameter is true.
You can use the_field() as well which works similar to get_field() you used.
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