Batch multiple queries in a single API call and drop in queryParams using the structure above.

{"query1":*[_type == "post"]{title, content}, "query2":*[_type=="category"]{title}}

{
   "query1":*[_type == "post" && slug == $post_slug]{title, content}, 
   "query2":*[_type=="category" && slug == $cat_slug]{title}
}

.fetch({
   "query1":*[_type == "post" && slug == $post_slug]{title, content}, 
   "query2":*[_type=="category" && slug == $cat_slug]{title}
},{ $post_slug:'foo', $cat_slug:'bar'});

const res = fetch ('<https://foobar.api.sanity.io/v2021-10-21/data/query/production?query=>' + encodeURIComponent('QUERY HERE'))

{"sidebar":*[_type == "sidebar"]{title, content, "fileURL":pdf.asset->url},"contact":*[_type=="contact"][0],"pages":*[_type=="pages"]{title, "slug":slug.current},"settings":*[_type=="siteSettings"][0]{...,"logos":{"primary":logo1.asset->url, "secondary":logo2.asset->url},sponsors[]{title,"url":logo.asset->url}}}

{ myBigQuery: *[…]{ a bunch of stuff}, myOtherBigQuery: etc… }