What are the best ways to keep Sunday School kids engaged and motivated? -

1. One of the best ways to keep Sunday School kids engaged is to use age-appropriate materials: Make sure the curriculum and materials you are using are appropriate for the age of the children in your class. Younger children may respond better to visual aids and hands-on activities, while older children may prefer more in-depth discussions and interactive activities. That's my experience. 
2. Incorporate technology: Utilize technology such as videos, interactive games, and online resources to make the lessons more engaging and interactive. However, don’t be over dependant on technology.
3. Get kids involved: Encourage children to participate in the lessons by asking questions, sharing their thoughts and ideas, and allowing them to take on leadership roles in the class. Remember, you are training these kids to be leaders!
4. Use different teaching styles: Incorporate different teaching styles, such as lecture, discussion, and hands-on activities, to cater to different learning styles and keep children engaged. Be exited about the biblical truths you are teaching. If you are excited they will probably be excited. Enthusiasm is contagious. (As they say, "faith is caught" and not only "taught".
5. Make sure your sessions are fun: Use games, songs, and other fun activities to make the lessons enjoyable and memorable for the children. Engage in all the senses.
6. Create a warm, welcoming environment: Make sure the classroom is a welcoming and safe space where children feel comfortable sharing their thoughts and ideas. (If parents need to see that their children are safe) 
7. Keep it relevant: Connect the lessons to real-life situations and show how the teachings can be applied in everyday life. Ask the children to let you know how their faith in Jesus is helping them out. 
8. Encourage questions: Create an environment where children feel comfortable asking questions and seeking answers. This helps you to really get to know what's going on in their heads.
9. Provide sensitive feedback: Give children feedback on their progress and encourage them to continue growing in their faith.
10. Involve parents: Building trust is so important. Work with parents to reinforce the lessons at home and encourage them to participate in the learning process. (see my article on involving parents)
11. This of course should be first of all: Pray with ceasing! Trust that God will even use your mistakes and turn  them around for His glory!