allotted allow charged disk downgrade limits listed month option plan products subscription tommorrow usage

I only have 5 products on here now and would like to downgrade my subscription from $10 a month to $5. It wont let me change to the $5 a month option. I don't want to get charged $10 tommorrow when I only have 5 products listed on here. Please allow me to downgrade my subscription.

$5 plan also limits the disk space allotted to 50 MB. You will not be able to downgrade if your disk space usage is more than that.