If you want to write a simple, respectful line for someone who has taken Jain dikshā / become a Jain muni, you can write for example:

In Gujarati:

• “Ājnuṁ pavitra divas – Jain munivar e paramārth no dharma pāmyo chhe. Temne apar saiyam, shakti ane ātmik unnati mate mangal āshīrvād.”
• “Munivarshri e sansār chhodi ne mokṣmārg ne apnāvyā chhe. Temnuṁ saiyam jīvan amārā māṭe prerna bane.”

In Hindi:

• “आज के पावन दिन जैन मुनिराज ने परमात्म धर्म ग्रहण किया है। उनके संयम और आत्मकल्याण की साधना हमारे लिए प्रेरणा बने।”
• “मुनिश्री ने संसार का त्याग कर मोक्षमार्ग को अपनाया है, हम उनके पवित्र जीवन को प्रणाम करते हैं।”

In simple English:

• “On this holy day, the Jain monk has accepted the path of true Dharma. May his life of great self‑restraint inspire all of us.”
• “We bow to the Jain muni who has renounced worldly life and adopted the path to liberation.”

You can choose whichever language and line feels closest to your feelings and adjust the name (e.g. “Munishri [Name]”) if needed.