Hello Student,

Hope you are doing well

Basically it is completely depend upon your passion. But I can suggest you to not go for Telugu and Malayalam because they both were basically more complicated then Tamil and Kannada.

My advice is that you can choose between Kannada and Tamil to learn from Hindi easily it can take about 44 weeks or 1100hours to learn, according according to a survey.

You can watch a lots of Tamil films with Hindi subtitle this can help here. But I cannot guarantee you with Tamil written form. Tamil has less number of letters as well. It will help you to learn Kannada.