Migrating from different wikis to Confluence is not a easy task . I made some searches around however I did not found any free "click and migrate" solution.
Just for a background in the past there was an add called (UWC) that would help with that:
It was not very easy to use and is only compatible with 4.3.7 ( also very outdated).
For this specific task I would really advise you to reach atlassian experts for a custom migration:
Experts services are subject to a quote.
I know it's a paid service, but depending on your current scenario, that would be the safest and easy option to achieve this migration.
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