It is possible to trace transactions on the Bitcoin blockchain, but if someone loses access to their wallet or private keys, it is unlikely that the lost Bitcoin can be recovered.
Yes, there is no way to get our bitcoins back if we lose the private key or seed phrase. That is one of the advantages of bitcoin as well as its disadvantages. No one can touch your bitcoins while you hold your keys, but if you are careless you will also bury your own bitcoins with no way of getting it back.