Sis Handmade Accessories — Artical missing

I have an online E commerce store. i send Parcel On Date - 28/12/23.
Parcel Details - 6*14*15cm, Tracking No- RD[protected]IN,
My Parcel is not deliver yet after the (50 days from the sending)
please do most appropriate steps for this on the priority basis, find and deliver my parcel asap also provide me the proof of delivery so I can use it to close the article missing report on my e commerce store.