How can I navigate, with keyboard, to the Right Sidebar's Cards?

Try this:

document.addEventListener("keydown", (e)=>{
    if (e.ctrlKey && e.altKey && e.key === "c") {
        const div = document.querySelector(".sidebar-item")
        if (!div) return

        const span = div.querySelector("span.inline")
        if (!span) return

        span.dispatchEvent(new MouseEvent("mousedown", {
            bubbles: true,
            cancelable: true
        }))

        function escape(){
            const ta = div.querySelector(".block-editor")
            if (!ta) return

            ta.dispatchEvent(new KeyboardEvent("keydown", {
                bubbles: true,
                keyCode: 27
            }))
        }
        setTimeout(escape, 300)
    }
});