Don’t get another car. That’s idiotic, you already have a car and all it needs is a shop that can work on it.
This is what I did:
P85D with an old battery that was kicking out roughly 130 ish miles on full charge (even though it said 220 on the IC). I checked out battery replacement options like wk057 replacement, but that was too pricy for me. I looked up Salvage battery packs on car-part.com and found a 100 kWh pack from a ‘19 non-raven MS. Drove with a Home Depot 3Ton and picked up the pack and drove it to a shop that can swap packs. Paid the shop 500 to do the swap. LazY did the software configuration. Went from a P85D > P100DL. (I rooted the car prior and changed the performance in the gateway.cfg so that it was Lud). Purchased a new rapid mate connector that can handle the extra amps. After the shop swapped the battery, I got 300 miles of range, faster supercharging speeds, and a MUCH faster car. I then took the old battery and removed all the modules in my garage. This was at first challenging without a fork lift. But I rented that 3 ton truck from home depot and the dumpt trailer. After I backed the battery into my driveway I dumped the battery onto some old tires in my garage. This got the old battery out of the shop so that I could harvest the modules at my own pace. I sold the modules online via FB market place and ebay. Luckly I met a local guy so we could do business outside of Ebay and save on fees. All in all, I spent roughly $6K on the swap. There are reasonably priced battery packs that will breathe new life into your Car. It won’t have a warrenty, but these packs are well built enough that you should get another 6 to 8 years without trouble. Hopefully by then, there will be more affordable solutions available. But I would check with eletricified garage and the like to see what it would cost to do a simple battery swap. Requires a car lift and a table to capture the battery once the car is lifted off it. Any collision center that does work on Tesla’s is also capable of battery swaps in the event they have to repair damage in and around the battery. You just need to pay them under the table and they will do swaps. There is nothing wrong with your car, it just needs a heart transplant. Don’t give up hope. Keep you unlimited supercharging and restore the functionality of your model s.