Some cars have batteries that must be replaced, whereas others are rechargeable. Charging may take a day or two, but depending on the car, it may be normal. If you do not have a charger, I recommend buying another, or if it is an older car, the chargers may only be sold on sites where you can buy a gently used charger that is inexpensive, and fits the make and model of your toy car. If these techniques do not work, I would suggest seeing a specialist to see if there is possibly something wrong with the remote, or the connection between the car and the remote.
I wish you the best,
Jolie Summers