Vaishnava Samhita. Dhruvadasa Charitam. Vol II Book VI Chp 7 Shloka 45

आचार्यं शरणं गच्छ गोपीनाथमहाप्रभुम्  |
हरिवंशस्य तनयं कृष्णसेवापरायणम्  ||

Till the end of your life reside in this Brindavan. Surrender to Gopinatha, the divine son of Hitaharivamsha who is having service to Shri Krishna as his only object in life. Take him to be your guru.