Shopify Website Management

I am looking for an expert in Shopify websites to take on the ongoing and regular maintenance, updating and management of our Shopify site - https://spaceandsoundstore.co.uk

It will involve the following (but not limited to):
Amending product prices
Creating product offers and discount codes
Adjusting and editing product descriptions
Adding new products and product ranges
Creating blogs on the site (copy provided by others)
Optimising the site for Google search
Creating ad banners and other graphics to enhance the site and keep it dynamic

Please only respond to this if you can commit ongoing for the forseeable future.