Godan verb with 'ru' ending, Intransitive verb
to come back (to); to return to a starting point
面倒なようでも、基本に立ち返って検討し直したらどうだろう。急がば回れ、というじゃない。It may seem like a hassle, but I think you ought to go back to the basics and start over. Haste makes waste they say.
Also written 立ち帰る【たちかえる】