If you need help making the /r/ sound, watch this video. Remember to keep the sides of your tongue anchored between your back molars. Your tongue should feel like it's far back in your mouth and flexed like a muscle.
To practice speech sounds at home, try to aside 15 minutes a few times a week. Spend the first 3-4 minutes going through a word practice list. Then try practicing the sounds in a more natural activity, such as reading aloud or playing a simple game. See the Articulation page for more practice activity ideas.
Choose a list depending on the context of /r/ that your child is working on. We typically start with initial /r/ words and then move on to blends, medial, and vocalic /r/. You can get information about what your child is working on by looking at their IEP, progress reports, or by contacting me! Going through a list of words for just a couple of minutes a few times a week will really help your child's progress! You can either pull them up on a device or print to put up on the fridge or somewhere you will regularly see them! Your child may need you to model the word for them first so they can hear your good production and see where your tongue goes in your mouth. Older children may be able to practice more independently.
I have lots more where this came from! I have many more resources that I just can't legally share on this public site. To request more materials for your child's specific goals, contact me! I will email them directly to you.