Hey Mainak,
I would like to suggest doing one of the following ideas:
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Host a community sentence collection campaign - as a way to highlight how members can generate and highlight cc0 sentences. You could get funding support via the Mozilla Reps.
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Have you also considered reaching out to Bangla written news outlets or cultural institutions - to donate sentences from the online archives into cc0 - you can use the cc0 waiver process
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Although not official advice - some communities have translated and adapted corpus texts from languages similar to theirs. They then used automatic translations and had reviewers check the sentences and then added them as a bulk submission.
Sorry for the delay in response - I have been on PTO.