Replace boot or not?

So my 2010 has 175k on it. Original brakes still good. I've gotten the death rattle 1-2 times every couple of years, so like 1-2 times in 2015, 2017, 2021. Even so I've never had any fluid issues. Just oil changes, less frequently than recommended. The fuel injection, throttle body, and engine coolant was serviced 2016. Inner rack ends, stabilizer bar, and struts replaced in 2017. Since 2020, add Lucas Oil Fuel Addative 1 time a year . It's missing rear spoiler, undercarrage skirt and left front wheel well skirt for over 5 years. The HVB does drain to 1 bar when driving, yet I've not noticed a significant loss in MPG. Toyota just serviced it and the only isse found is a torn R-n-P boot. They say I can just replace the boot + alignment + labor for 1.6k. I'm sure I can find someone to do it cheaper. I'm thinking of fixing it but idk if it's really worth it since the HVB is going and it's already rattled several times. What are your thoughts? Would you replace the undercarrage & wheel well skirts, spoiler, battery? Replace any other fluids or parts?

Thanks