Dont cancel visa, if u cancel without NOC u will BAN for 2 years. U Can easly change u r profession. lot of agency are here for the same.

if u r going to bring Permenent family status some other criteria also there. Salary Minimum 10K, rental Agreement, Attested maariage certificate etc.. like that Profession changing.. these are all not not much difficult..Think one by one and finish it each one..u can do within 1-2 months..