For a couple of tips to even motivate you. First off your gameplay actually improves if you make sure you sleep enough, eat well and drink enough. But even simple things like keeping your room clean can help. Since a tidy room is also a tidy mind for most. For what you can do while you are grounded. Focus maybe on watching a hour of gameplay and for the rest do things that aren't related to rocket league. just go outside and have fun, so that when you come back you had a great time without the game and have a fresh mindset going into your new sessions