You didn't trace anything. How does this identify the sender?...Did you narrow it down to a single sender? There are always 15 decoys and 1 true spend. You can't tell us which one is the true spend (unless this is your personal transaction then of course you know.)

Thats how rings work.

And mind this is a single transaction. As time goes on, you transact more, and it's chosen as decoys for other transactions, your probability for tracing rapidly falls off.

original 16 = ~6%
1 hop 16^2 =  ~0.4%
2 hops 16^3 =  ~0.02%