REST API compare current user if exist in a custom list

GET request has maximum length limit configured in the web.config. It is 260 characters I guess. So it is the reason you can not make more than 35 filters.

So now you can consider POST and CAML. Make a CAML Query like following. field1 and field2 are considered in the following query. Do not forget to include others.

var query = "<View> " + 
 "  <Query> " + 
 "    <Where> " + 
 "      <Or> " + 
 "        <Eq> " + 
 "          <FieldRef Name=\"field1\" /> " + 
 "          <Value Type=\"Integer\"> " + 
 "            <UserID Type=\"Integer\" /> " + 
 "          </Value> " + 
 "        </Eq> " + 
 "        <Eq> " + 
 "          <FieldRef Name=\"field2\" /> " + 
 "          <Value Type=\"Integer\"> " + 
 "            <UserID Type=\"Integer\" /> " + 
 "          </Value> " + 
 "        </Eq> " + 
 "      </Or> " + 
 "    </Where> " + 
 "  </Query> " + 
 "</View> "

Request Body

var data = {
    query: {
        __metadata: {
            'type': 'SP.CamlQuery'
        },
        ViewXml: query
    }
};

Now make a POST request to the following URL. I hope it will serve your purpose.

"/_api/web/lists/getbytitle('Global Contact List')/getitems";

Following things may help you to build CAML

1. U2U Caml Query Builder
2. Building CAML for querying List in SharePoint