20 minutes a day: Is focusing on Tagalog pronouns the best use of my limited time?

As a busy professional, I only have 20 minutes to spare in the morning. I’m currently oscillating between learning the 'ako/ko/akin' sets and simple noun phrases. Should I prioritize mastering the pronoun case system now to build a solid foundation, or will that kill my motivation before I even get to basic conversational Tagalog?