AP approvals rules go beyond 3000

Summary

Approval rules based on position hierarchy goes beyong 3000 rules.

Content

AP approvals need to go to each store for approval and each store has different position hierarchy to be followed. The total count of approval rules is more than 3000.

Is there a better way to do the approval?

In a typical scnario

1. AP user will create an invoice

2. Key in the requester name to whom the invoice should go for approval

3. the invoices should first go to requester and then based on amount it should go to levels up in the position hierarchy

4. The client don't want to hard code the requester name in the approval rule so the if condition if based on position id but the then condition not sure how to make it to go to requester? so the invoice approvals are created in "InvoiceRequestAdditionalApprover" but the rule is not getting invoked.