The tricky part about solo traveling somewhere unfamiliar is you either play it way too safe or you just wing everything and hope nothing goes wrong. Getting a car sorted before you even arrive takes all that stress away because you land, grab your keys, and boom you're already mobile instead of wasting your first day figuring out how to get around. Check out the car rental options in Kazakhstan here
https://getrentacar.com/en-US/kazakhstan . You can browse through what private owners are listing, find something that fits what you need, and book it all online before you even land. Your car will be waiting for you, so you just show up and start exploring on your own schedule.