I don't think the death penalty is a practical solution. There are times when I think individuals deserve it, but you cannot recall a wrongly-convicted person from the dead.
I do think a life of crime should be made utterly profitless. If I was in charge there would be a concept of criminal bankruptcy, and the guilty party would have all their assets and income sequestered so that they would never have more than the bare dole until they repaid all the costs of their crimes.
But I also think there needs to be a vast investment in rehabilitation, including drug rehabilitation. In some cases, what is needed is treatment in a mental hospital, long or short-term. They may also need education because many are illiterate or innumerate. You would give them credit for achieving genuine targets.