Why the disciples returned to fishing after Jesus died on the cross?

Before the crucifixion of the Lord Jesus Christ, the necessities of Him and the disciples seem to have been provided by the charity of other individuals (Luke 8:3). It is probable that after the crucifixion there were no more sources of income and not fully knowing how they were to be employed they returned to their former way of life and that was fishing. The seven mentioned in John 21:2 fished in the sea of Tiberias also known as the sea of Galilee. This fishing expedition revealed the uncertainty of the disciples.