If tracking has stopped, please allow it at least two weeks (domestic) or eight weeks (international) to see if there are any further updates. Sometimes tracking stops but your package is still making its way towards you. Once the allotted time is up and you still have not received your package, please get back in touch with me, and we will sort this out as soon as possible.
In any case, there are multiple steps you can do to find your package such as submitting a search request via the USPS, here: https://www.usps.com/help/missing-mail.htm
Be sure to ask those who might live in the same household as you to see if they retrieved the mail.
If you think your package may have been stolen, file a police report with your local department!