Optimizing a SPARQL query - sparql

Question

I'm trying to get the details of an organization based on the official website of the company using the below query. It constantly gets timed out.
I require all the below fields. Is there a way to optimize it? I understand that OPTIONAL is equivalent to an INNER JOIN and is the cause of the timeouts but is there any other way of getting these fields?
I'm using the python api and setting a timeout of 5mins doesn't help either. The timeout value doesn't get set.
SELECT distinct
(GROUP_CONCAT( DISTINCT ?official_name; separator=";") AS ?official_name)
(GROUP_CONCAT( DISTINCT ?isin; separator=";") AS ?isin)
?item
?itemLabel
?stock_exchange
?stock_exchangeLabel
(GROUP_CONCAT( DISTINCT ?ticker; separator=";") AS ?ticker)
(GROUP_CONCAT( DISTINCT ?other_name; separator=";") AS ?other_name)
(GROUP_CONCAT(DISTINCT ?parent_orgLabel; SEPARATOR = ";") AS ?parent_orgLabel)
(GROUP_CONCAT(DISTINCT ?owned_byLabel; SEPARATOR = ";") AS ?owned_byLabel)
(GROUP_CONCAT(DISTINCT ?instance_of; SEPARATOR = ";") AS ?instance_of)
(GROUP_CONCAT(DISTINCT ?instance_ofLabel; SEPARATOR = ";") AS ?instance_ofLabel)
(GROUP_CONCAT(DISTINCT ?domains; SEPARATOR = ";") AS ?domains)
(GROUP_CONCAT(DISTINCT ?subsidiaryLabel; SEPARATOR = ";") AS ?subsidiaryLabel)
(GROUP_CONCAT(DISTINCT ?owner_ofLabel; SEPARATOR = ";") AS ?owner_ofLabel)
(GROUP_CONCAT(DISTINCT ?part_ofLabel; SEPARATOR = ";") AS ?part_ofLabel)
WHERE {
SERVICE wikibase:label { bd:serviceParam wikibase:language "[AUTO_LANGUAGE],en". }
{
{ ?item p:P856 [ ps:P856 <https://www.amazon.com> ]}}
OPTIONAL {
?item p:P856 ?web_domains.
?web_domains ps:P856 ?domains .
}
OPTIONAL { ?item wdt:P1448 ?official_name. }
OPTIONAL { ?item wdt:P946 ?isin. }
OPTIONAL {
?item p:P414 ?SE .
?SE ps:P414 ?stock_exchange .
?SE pq:P249 ?ticker .
}
OPTIONAL { ?item skos:altLabel ?other_name. FILTER (LANG (?other_name) = "en") }
OPTIONAL {
?item wdt:P361 ?part_of.
?part_of rdfs:label ?part_ofLabel.
filter(lang(?part_ofLabel)="en")
}
OPTIONAL {
?item wdt:P749 ?parent_org.
?parent_org rdfs:label ?parent_orgLabel.
filter(lang(?parent_orgLabel)="en")
}
OPTIONAL {
?item wdt:P127 ?owned_by.
?owned_by rdfs:label ?owned_byLabel.
filter(lang(?owned_byLabel)="en")
}
OPTIONAL {
?item wdt:P31 ?instance_of.
?instance_of rdfs:label ?instance_ofLabel.
filter(lang(?instance_ofLabel)="en")
}
OPTIONAL {
?item wdt:P355 ?subsidiary.
?subsidiary rdfs:label ?subsidiaryLabel.
filter(lang(?subsidiaryLabel)="en")
}
OPTIONAL {
?item wdt:P1830 ?owner_of.
?owner_of rdfs:label ?owner_ofLabel.
filter(lang(?owner_ofLabel)="en")
}
}
GROUP BY ?item ?itemLabel ?stock_exchange ?stock_exchangeLabel