Looking for best way to pay down student loan with Direct Loan interest rate reduction for the next two years.

Currently, my student Direct Loans on auto pay are allowed a 1% interest rate reduction for the next two years until 2028. I currently have 4 student loans remaining at current rates with interest rate reduction at 3.3%, 4.3%, 3.3%, and 4.28%. The amount left spread across the 4 remaining loans is ball park range of something buying a Nissan GTR or Porsche 911 without being specific. Currently loan paying method is paying down highest interest loan in the lot.

Other than paying down loan monthly. I am looking for methods utilizing any available tool whether it be investing in high yield savings for the next two years to build a position to pay down the loan. Currently, I am split between utilizing funds like VOO, high yield accounts, or return of capital funds. I'm aware generally use high yield accounts if there is plan to use cash within 5 year period for house down payment. I assessed the benefits of the current unchecked market growth in index fund like VOO outweighs risk for market crash. We're constantly tossing money into S&P500 benchmarked 401k portfolios when markets go red for a week or month. We'll still be tossing money into the 401k when the market crashes.