How MySQL group_concat works on shared hosting

I have the following query

SELECT 
    Dpn.Department_ID,
    Dpn.Department_Name,
    Dpn.Department_Icon,
    Dph.department_info_header,
    GROUP_CONCAT(Dpi.department_info_service SEPARATOR ', ') AS department_info_services,
    CONCAT('[', GROUP_CONCAT(
    DISTINCT CONCAT(
        '{\"Doctor_ID\":', Dc.Doctor_ID,
        ',\"Doctor_FName\":\"', Dc.Doctor_FName,
        '\",\"Doctor_LName\":\"', Dc.Doctor_LName,
        '\",\"specialization\":\"', Dc.specialization,
        '\",\"doctor_img\":\"', Dc.doctor_img,
        '\",\"appointment_fee\":', Dc.appointment_fee,
        ',\"is_part_time\":', Dc.is_part_time,
        ',\"votes\":', Dc.votes,
        ',\"bio\":\"', IFNULL(Dc.bio, ''), '\"',
        ',\"patient_served\":', IFNULL(PatientCount.count, 0),
        ',\"schedules\":', IFNULL(Schedules.schedule_json, 
            '[{\"day_of_week\":\"Monday\",\"start_time\":\"08:00 AM\",\"end_time\":\"06:00 PM\"},' ||
            '{\"day_of_week\":\"Tuesday\",\"start_time\":\"08:00 AM\",\"end_time\":\"06:00 PM\"},' ||
            '{\"day_of_week\":\"Wednesday\",\"start_time\":\"08:00 AM\",\"end_time\":\"06:00 PM\"},' ||
            '{\"day_of_week\":\"Thursday\",\"start_time\":\"08:00 AM\",\"end_time\":\"06:00 PM\"},' ||
            '{\"day_of_week\":\"Friday\",\"start_time\":\"08:00 AM\",\"end_time\":\"06:00 PM\"},' ||
            '{\"day_of_week\":\"Saturday\",\"start_time\":\"08:00 AM\",\"end_time\":\"06:00 PM\"},' ||
            '{\"day_of_week\":\"Sunday\",\"start_time\":\"08:00 AM\",\"end_time\":\"06:00 PM\"}]'
        ), '}'
    )
    ), ']') AS Doctors
    FROM 
    Department Dpn
    JOIN 
    DepartmentInfoHeader Dph ON Dpn.Department_ID = Dph.Department_ID
    JOIN 
    DepartmentInfo Dpi ON Dpn.Department_ID = Dpi.Department_ID
    LEFT JOIN
    Doctor Dc ON Dpn.Department_ID = Dc.Department_ID
    LEFT JOIN (
        SELECT 
            Doctor_ID,
            CONCAT('[', GROUP_CONCAT(
                DISTINCT CONCAT(
                    '{\"day_of_week\":\"', day_of_week,
                    '\",\"start_time\":\"', DATE_FORMAT(start_time, '%r'),
                    '\",\"end_time\":\"', DATE_FORMAT(end_time, '%r'), '\"}'
                ) 
                ORDER BY
                    CASE day_of_week
                        WHEN 'Monday' THEN 1
                        WHEN 'Tuesday' THEN 2
                        WHEN 'Wednesday' THEN 3
                        WHEN 'Thursday' THEN 4
                        WHEN 'Friday' THEN 5
                        WHEN 'Saturday' THEN 6
                        WHEN 'Sunday' THEN 7
                    END
            SEPARATOR ', '), ']') AS schedule_json
        FROM 
            DoctorSchedules
        GROUP BY 
            Doctor_ID
    ) Schedules ON Dc.Doctor_ID = Schedules.Doctor_ID
    LEFT JOIN (
        SELECT 
            Doctor_ID,
            COUNT(*) AS count
        FROM 
            Patient_Results
        GROUP BY 
            Doctor_ID
    ) PatientCount ON Dc.Doctor_ID = PatientCount.Doctor_ID
    GROUP BY 
    Dpn.Department_ID, Dpn.Department_Name, Dph.department_info_header;

They are working just fine but the problem is am using shared hosting and I can not execute SET GLOBAL group_concat_max_len = 1000000; the current length of group concat is 1024 only, any suggestion to fix that?

I have tried also SET SESSION group_concat_max_len = 1000000; also doesn't work, I've tried using JSON_ARRAYAGG and JSON_OBJECT works fine but I get triple Doctors for each department.