Why don't you do both. If you going to trade bitcoins and only 3-4 alt coins, this can be easily done along with job. Problem with bitcoins is that you cannot prices to rise always and thus you will not be able to get monthly stable income. This can be a huge issue if you are having a family to support. If you got someone supporting you for monthly expenses like your wife, then you may do crypto trading full time. Even that will require you to spend some time learning about trading practices and choosing best options from currently available coins.