In Jainism, a siddha atma is a fully liberated soul. It is free from karma, body, senses, and worldly bondage.

So:

• A siddha does not see the world like we do with eyes.
• A siddha does not act in the world or “help” by doing work or granting wishes.
• A siddha is beyond worldly activity, and rests in the state of pure consciousness at Siddhashila.

When we pray to a siddha, the prayer is for devotion, remembrance, and inner purification. It helps us become शांत, श्रद्धालु, and inspired toward the path of liberation. It is not that the siddha comes down and changes worldly events.

So the simple answer is:

No, a siddha does not help people in a worldly way after prayer, but prayer to siddha is spiritually beneficial for the devotee.