This error message...
org.openqa.selenium.TimeoutException: Expected condition failed: waiting for element to be clickable: Proxy element for: DefaultElementLocator 'By.id: user email' (tried for 500 second(s) with 500 milliseconds interval)
...implies that the TimeoutException was raised while attempting to click on the element inducing WebDriverWait.
The relevant HTML of the element along with your code trials would have helped us to analyze the issue in a better way. However, the Locator Strategy as 'By.id: user email'
looks incorrect to me.
Solution
As a solution you can try either of the following solutions:
cssSelector:
new WebDriverWait(driver, 20).until(ExpectedConditions.elementToBeClickable(By.cssSelector("#user"))).click();
xpath:
new WebDriverWait(driver, 20).until(ExpectedConditions.elementToBeClickable(By.xpath("//*[contains(@id,'user')]"))).click();