I have wrongly shown itc in reclaimable itc instead of ineligible itc how to reclaim and correct it

You cannot revise the filed GSTR-3B. Since the ITC was actually ineligible / non-reclaimable, it should have been reported in Table 4(B)(1) and not in 4(B)(2).
If it was only a reporting/classification mistake and the ITC already stood reversed, then generally no fresh reclaim should be taken. Keep proper reconciliation and reflect the correction in your subsequent-period records/working papers.
If any ineligible ITC was actually availed/utilized, then interest implications should also be checked separately.

GSTR-3B cannot be amended after filing, but the fix is straightforward: in your next return period, add a reversal in Table 4(B)(1) for the amount that was wrongly put in 4(B)(2). This nets out the error across periods. If the portal has already flagged a DRC-01C notice because your ITC claim exceeded GSTR-2B, prepare a reconciliation statement with invoices before responding, since the deadline to reply is typically 15 days from receipt. A step-by-step workflow for this is here if it helps: https://taxgarden.in/resources/gst-notice-response-workflow-india-sme