Jesus after being tortured by the Roman soldiers was unable to carry his cross. Who did the Romans recruit to do this?

Simon of Cyrene was forced to carry Jesus cross.

Source: Matthew, 27:32, Mark 15:21, Luke 23:26

There is one instance in the gospels of Jesus challenging a man to take up his cross. Why couldn’t the man do this?

Jesus asked the man to give up his wealth and follow Jesus. Because he was very rich he could not.

Source: Mark 10:21-22