Do I focus on Paying off my mortgage?

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Hey Everyone!

I'm closing on my first property that I will be house hacking with. I'm in a condo with a buddy paying me rent. I will have a $220k 30-year fixed rate mortgage at 4.875%. Using amortization calculators I noticed I could pay off the loan a lot faster by adding extra payments. It's a little scary seeing I'm paying the cost of the condo just in interest after 30 years.

With that said, if I want to buy another property in the next 5 years should I focus on paying down the mortgage on this current property? If so, by how much? I have the extra income to be paying up to an extra $1k per month which significantly shortens the life of the loan. What are advantages and disadvantages?

Thanks!