You don't have to buy a new new car...
You could buy a 8 year old car - but that could also need some money after you buy it.
Still, if you feel that you don't trust your car anymore I would say it is time to change that.
Is your 1 mil net worth goal so important 😃? I agree that it would be even for me it if I would miss it by 5k because of replacing an unsafe car I would not kill miself for that 😃. Just don't continue to miss it...
Now, regarding all weather tires.
Why do you buy them? If you have more than 1-2 months of weather below 7 Celsius plus some snow you should go for winter plus summer tires.
I have all weather tires on my car now and I don't like them at all.
Winter tires are not needed here but I can't get by with only summer tires.
All weather tires will decrease your mileage and performances in both cold and warm conditions compared to summer and winter tires.
Two pairs of tires might cost more, but if you drive your car all the time they might be worth it.