Short answer: Ravana is not and cannot be the next Tirthankar in Jainism.

Key points:

• In Jainism, there are exactly 24 Tirthankaras. Mahavira is the 24th in this time cycle (Avasarpini), and no additional Tirthankara is listed for this cycle.
• Ravana is not recognized as a Tirthankar in Jaina scriptures. He is not counted among the 24, and Jain teachings do not promote him as a spiritual ideal or a future Tirthankar.
• Some stories about Ravana exist in popular lore, but Jain texts emphasize non-violence, truth, and spiritual release, which Ravana’s life as depicted in many traditions does not exemplify. Therefore, declaring him as the “next Tirthankar” goes against canonical Jain doctrine.
• If you’re asking in the sense of “which great soul could inspire us now,” Jainism points to the teachings of the 24 Tirthankaras and to the path of the Shri Mahavira’s teachings, not to Ravana.

If you’d like, I can share the traditional Jain view on who the 24 Tirthankaras are and what distinguishes a Tirthankar from other revered figures.