Magento 2 - Multi Store Multi Storeview - Create Custom Order Prefix and start from custom Order, Invoice, Shipping and Credit Memo Number

Hello, we have a Magento 2 Installation with 3 different active stores and 2 languages each. In total 6 Stores in Backend. We had our old Magento 1 store orders imported and hence have already existing Orders, Invoices, Shipping labels and Credit Memos for 2 of the stores. Now we need to adjust the Order #, Invoice #, Shipping # and Credit Memo # for all 6 stores in order to continue and not start from 000000001 again. Need someone with profound knowledge in Magento 2 and maybe already someone who did this kind of task. If you can finish today I would prefer that since we arer already live. Best regards alex