Is there a way to automatically unburn to guru?

I’ve come back after a couple of years and want burned items to occasionally come back into my reviews. Is there an api method or way on the website to unburn everything to guru level?

I already dropped my level down to 4 to redo a lot of what I’ve done before

Unfortunately you can only unburn to Apprentice 1. This feature has been requested before though, so I’d recommend emailing WaniKani with this request. The more people that request it the more likely they are to add it.