What can I do with my lost bitcoins? Nothing, because it disappear quickly so I will start a new one then I wouldn't do the same as my past. I learned from my past so I will be more careful with my new bitcoins. I will do double time to earn more bitcoins then I will use it in good not for gambling.
Someone would obviously not be able to do anything with his lost bitcoins, so they have to be careful before losing them that they don't lose them anywhere because once they are lost then they can only try earning more but cannot get the lost ones.
Thats right you need to be careful in using your bitcoins because if you loose your bitcoin it aint go back to you It will disappear on an edge.
if you send it to wrong address and if someone notices that your bitcoin is sent wrong , It can go back into your wallet if you sent it to a good person