Question to all financial sifu.

I got a shoplot, already own for 6 years now only the rental break even with the monthly installment. I have no problem paying the monthly installment and the rental i received should go all in to pay the principal off or sumbat into EPF?

Few points to consider.
- I have enough savings to survive 1 year without working.
- Currently in the highest tax bracket. So if i pay principle i lowered the interest amount i end up paying more tax? dunno how to calculate this.
- unfortunately i dont have flexi loan.
- total noob in investment. never play stock market. Tried invest some trust fund all end up rugi. As the saying goes, i am the type that kena curse to only profit by working hard. No shortcut in my life in regards to asset gain. I lose out everytime i venture out of property/FD/epf.