I was in a similar position this summer and I sold mine. It feels like an inconvenience to go without a car after having one, but the monthly parking and insurance payments, + the stress of maintenance on the car is also inconvenient. If you use it more than twice monthly, especially for long distances, it probably makes sense to keep it if you’re willing to pay for the convenience of having a car at your disposal 24/7. If you can go without it for 4 weeks or more, ditch it. It’s a bit of a pain in the ass to coordinate a rental car when I need it but it’s just an adjustment I was willing to make