Options for follow-up financing

Dear Carbonara disciples, since we are currently almost exactly halfway through the fixed interest rate on our real estate financing, I have started to look a little at follow-up financing and our options. Since we still have a contract from the good old days of low interest rates, we do not put our regular surplus and unplanned income such as bonuses into special repayments, but rather invest them (currently in stock ETFs). This creates perspective