In Jain Dharma, manushya janam is not fixed by date or time. It depends on your karma, bhāv, and the state of your ātmā at the time of death.

So, you will get manushya janam again only when the right karmic conditions are present. It cannot be told with certainty by an ordinary person.

In short:

• Punya and shuddha bhāv support favorable rebirth.
• Mohanīya, āyu, and other karmas decide the next gati.
• If the soul accumulates the right karmic causes, manushya gati can arise again.

According to Jain teaching, the best way to secure a favorable future birth is to:

• follow Ahimsa
• practice Satya
• reduce kashāyas like anger, pride, deceit, and greed
• do samyak darshan, samyak jñān, and samyak charitra
• live with vairāgya and aparigraha

If you are asking spiritually, the most important thing is not “when” but how to create the causes for a better birth and moksha.