I’d ditch my car for the bike entirely if not for road trips.
The next step is to tally up the yearly costs of owning a car with all that this incurs, then weigh that against how many days per year you typically go on road trips and how much car rental would cost you in the amount of days you’d have to hire a car for.
If it looks like you’d more or less break even without factoring in those surprise costs that happen with car ownership (“Gee, that’s a nice alternator you’ve got there! It sure would be a shame if some day it decided to shit itself and then you’d have to pay for a tow to the mechanic’s to replace the thing while missing a day of work…”) and you think you’d be fine renting for road trips then you’re probably going to be better off selling the car, especially in the long run.
What I’d do from there, if I decided to pull the trigger, would be to set up a secondary bank account and automatically transfer money that would go to typical car-associated costs like insurance/registration/gas and set up an automatic transfer into that secondary account. Also set aside enough money to replace your ebike from the sale of your car so if anything happens you aren’t going to find yourself in a tricky situation. Then use the money that accrues in that secondary account to fund car hire when you’re ready for your next road trip. It’s going to be painful shelling out a thick wad of cash for a car rental on your first road trip but keep in mind that car ownership is a financial form of death by a thousand cuts that you rarely think about since it’s just the cost of doing business.
Honestly, over time I’d expect that the secondary account would start filling up faster than you can spend the money on car rentals which might free you up to buy other things you want.
The other option is to find a good friend or loved one who would be willing to split the costs for car sharing arrangement between the two of you. This would be a little bit tricky to navigate and you’d want to make sure that you’ve got the right person to do this with but if you went about it the right way you should be able to come up with a mutually-beneficial arrangment.
There are studies about people like you (said in the most positive of ways).