one day I lost my device and that's how I lost the seed phase and the wallet. Am imagining if I could have recover my wallet today, I will be a big boy with fat wallet.
What a silly mistake, were you not told to keep your keys safe that such is what you will beed to have access to your coins on the blockchain, if he didn't inform you about keys and how important they were as the fund itself then he has the little fault to receive blame but if he already told or warned you about it, then it's your fault and it will be good for you to always put that in mind that not your keys means not your coins
Do you think another person have access to it?
It's there on the blockchain, am imagining what amount it would have turned to by now, it's just like you holding the coins on your wallet, buy if it were to be that the fund was sent to a wrong address, the coins will be lost and distributed back across the bitcoin network.