Again Forestry and Agriculture are somewhat related but Punjabi is altogether different. Start studying Agriculture, if you feel it interesting and you think you will be able to develop more interest in it with the passage of time and cover its contents within desired time then continue studying it. If you feel boredom in first 2 or 3 days then give Punjabi a try. Try to write Punjabi and evaluate yourself. If you don't find Punjabi interesting or easy then its upto you whether you want to opt this or Agriculture or Forestry. If you can memorize ashars its better to go for Punjabi otherwise you may stick to Agriculture of Forestry.

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Best end of life is not knowledge but action.
Don't limit yourself to what you think people are expecting!