I invite you to step away from the workbooks and structured online programs that mimic school learning. Enrichment can look so different from a traditional classroom. Ask questions. Share what you're thinking when you make a comparison or divide a strategy or wonder something. Don't be afraid of not knowing the answers to kids questions, instead explore together by testing theories and researching. I love the blog and book What If by Randall Munroe. https://what-if.xkcd.com/ While your kids won't know all the physics he does, they can certainly engage in a similar thought process.