Suggest --- Not bought for 6 months or not sold for more than a year and there have been a number of changes when now using eBay --- possible that a sudden flurry of purchases over the last month has alerted eBay and is triggering buying limits as below --- having a payment method on file often helps >

https://www.ebay.co.uk/help/buying/buying-limits-restrictions/buying-limits-restrictions?id=4012&st=...

https://www.ebay.co.uk/help/help/selling/getting-paid/introducing-managed-payments-ebay?id=4795

https://www.ebay.co.uk/help/account/changing-account-settings/changing-account-settings?id=4193