Damn man, that is just so heart breaking. If you were gonna do the best you can to find it, you should've done it earlier at the time it was lost. Because clearly, it is nearly impossible now to find those coins since they might have already been used in buying stuff or trading online in thousands if not millions of wallets. Although I know that you really did as much as you could back then but still haven't found it, I pretty much think that there would be any difference in looking for it now. Because by now, chances of finding it would've become thinner. I think that there won't be anything much that you can do about it anymore. Hope your story becomes a great lesson for everyone man, thanks for sharing.
And for what it's worth, I really am so sorry that you lost that much bitcoins.