How to increase concurrency when using KubernetesExecutor

[NXDnixiaodong]

I hope to increase the number of tasks running at the same time, but the number of tasks running at the same time has been running stably below 40 (as shown in the figure below). Below are some airflow configurations and dag configurations.
airflow 2.5.1
k8s 1.18.0

config:
  api:
    auth_backends: airflow.api.auth.backend.basic_auth
  core:
    dags_folder: '{{ include "airflow_dags" . }}'
    parallelism: 10000
    # This is ignored when used with the official Docker image
    load_examples: 'False'
    executor: '{{ .Values.executor }}'
    # For Airflow 1.10, backward compatibility; moved to [logging] in 2.0
    colored_console_log: 'False'
    remote_logging: '{{- ternary "True" "False" .Values.elasticsearch.enabled }}'
  logging:
    remote_logging: '{{- ternary "True" "False" .Values.elasticsearch.enabled }}'
    colored_console_log: 'False'
  metrics:
    statsd_on: '{{ ternary "True" "False" .Values.statsd.enabled }}'
    statsd_port: 9125
    statsd_prefix: airflow
    statsd_host: '{{ printf "%s-statsd" .Release.Name }}'
  webserver:
    enable_proxy_fix: 'True'
    # For Airflow 1.10
    rbac: 'True'
  celery:
    flower_url_prefix: '{{ .Values.ingress.flower.path }}'
    worker_concurrency: 16
  scheduler:
    standalone_dag_processor: '{{ ternary "True" "False" .Values.dagProcessor.enabled }}'
    # statsd params included for Airflow 1.10 backward compatibility; moved to [metrics] in 2.0
    statsd_on: '{{ ternary "True" "False" .Values.statsd.enabled }}'
    statsd_port: 9125
    statsd_prefix: airflow
    statsd_host: '{{ printf "%s-statsd" .Release.Name }}'
    max_dagruns_per_loop_to_schedule: "500"
    max_callbacks_per_loop: 500
    max_dagruns_to_create_per_loop: 50

dag = DAG(
    dag_id,
    max_active_tasks=100,
    max_active_runs=100,
    default_args=default_args,
    description='A DAG to read a matrix from a CSV file and perform matrix multiplication',
    schedule_interval=None,
    start_date=days_ago(2),
    catchup=False,
)