High mileage advice

I've got a 2018 Ford Fusion (1.5L EcoBoost) that's sitting around 186K miles. I bought it with 84K on the clock in 2020. I'm planning on making extra payments to get it paid off early, but I'm not sure what to do once I've got it fully paid off.

Part of me wants to keep driving it as I really enjoy the car and it doesn't have any issues currently (AFAIK).

Part of me knows 186K is a long life as far as the 1.5L EcoBoost is concerned and yearns for the comfort and peace of mind of lower mileage and a fresh warranty that comes with a new or lightly used vehicle.

I'm starting a new job that requires a total of 510 miles of highway driving a week, adding some fast miles to that count.

Any advice?