In Jain Dharma, there is no concept of choosing a “God” based on your birth tithi like Ekādashi (Agyārās). Every Jain—regardless of birth day—offers devotion to the Panch Parameṣṭhi:

• Arihant
• Siddha
• Ācārya
• Upādhyāya
• Sādhu

What to do on Ekādashi (Agyārās):

• Recite the Navkār (Namokār) Mantra with bhāva.
• If possible, observe upavās or āyambil, keep samyak vrat, and do pratikraman.
• Meditate on any Tīrthaṅkar (e.g., Ṛṣabhdev, Pārśvanāth, Mahāvīr) as per your devotion—the choice is personal, not fixed by tithi.

Key point: Jain worship is of virtues and the path to moksha, not astrology. The safest, most universal prayer is the Navkār Mantra.