Acess Database restructuring

My company started as a small entity and therefore used access to manage our data. We now have more than 250,000 records in this access database with strings of data collected over years. The original structure has now become so unweildy that it is now taking 4-5 hours to append data into this master database. I am looking for someone with extensive Access knowledge to come in and asess the issues with the access database. Restructure and get it to a point that it can be migrated to SQL or another suitable platform for the ammount of data being handled. ## Deliverables To be determined ## Platform Access