Rebirth is meant to help subs manifest faster and on the same day, so, as something to make you more productive NOW, its a good option.
And a lot of people report more productivity from sanguine as well, because it takes a calm mind to focus, but also because it takes a recon-free mind to be productive sometimes, and sanguine reduces recon
Either one of these would be a good bet to pair with LE
Edit: i saw in your journal GLM makes you more productive, and its known to be amazing for ambition and drive. Could be a good option