One can attain the path of liberation from material bondage only by rendering service to highly advanced spiritual personalities.
In our conditional stage, we cannot worship Radha and Krishna. Radha-Krishna-seva is for them who have developed spontaneous love for God.
There is no limit to the glory of Sri RadhaKunda. By serving Radha-kunda, one can get an opportunity to become an assistant of Srimati Radharani under the eternal guidance of the gopis.
For a materialistic person, the spirit to enjoy never goes away and for a devotee the spirit to serve never goes away.
The Reward for Service is simply that we have Served.
Service to the Vaishnavas is the most potent formula for getting the mercy of Spiritual Mater and Krishna.