Query exceeds max complexity of 30

[Maffle]

I am developing an application for Shopify that applies automatic volume discounts based on the product metafileds and the tag the user has.
Everything works correctly, the problem is that when I enter all the metafileds and tags of interest I get this error.

 
Validation errors
targeting.0.input_query: Query has complexity of 31, which exceeds max complexity of 30

Many people recommend reducing the cost of the query but I don't know how to do it. Can you help me out?

query Input {

  cart {
        buyerIdentity {
              email
              customer{
                  hasTags(tags : ["star","vip"]){
                            hasTag
                            tag
                  }
              }
        }
        lines {
          id
          quantity
          cost{
               prezzo: amountPerQuantity{
                                 amount
               }
               prezzoDiConfronto: compareAtAmountPerQuantity{
                                 amount
               }

          }
          merchandise {
                __typename
                ... on ProductVariant {
                  id
                  product {
                          star: metafield(namespace: "custom", key: "star") {
                                                         value
                          }
                          vip: metafield(namespace: "custom", key: "vip") {
                                                         value
                          }
                          dataStartvip: metafield(namespace: "custom", key: "datastart_vip") {
                                                         value
                          }
                          dataEndvip: metafield(namespace: "custom", key: "dataend_vip") {
                                                         value
                          }
                          dataStartstar: metafield(namespace: "custom", key: "datastart_star") {
                                                         value
                          }
                          dataEndstar: metafield(namespace: "custom", key: "dataend_star") {
                                                         value
                          }
                  }
                }
          }
        }
  }
  discountNode {
      metafield(namespace: "volume-discount", key: "function-configuration") {
        value
      }
  }
  shop {
    localTime {
      date
    }
  }
}

[tobebuilds · Accepted solution]

Each metafield you fetch adds 3 to your query complexity. I recommend storing a JSON object in a single metafield, rather than having 6 separate metafields on your product.