Setting.py Configuration for Production mode and Deployment

What I want to do is make all necessary changes in settings.py for Production purpose.When I set DEBUG=True,Everything works all right but when I set DEBUG=False,It makes me feel so tired and depressed.I have been trying for many days but could't figure out.Setting DEBUG=False, Static files runs and some don't but mediafiles completely stop working and i get Server Error (500) in some of the pages.And,I know the fix is in settings.py but don't know how to?

import os
from pathlib import Path

BASE_DIR = Path(__file__).resolve().parent.parent

SECRET_KEY = ')osa2y(^uk4sdghs+#(14if-)b1&6_uo@(h#0c%sci^a#!(k@z'

DEBUG = False

ALLOWED_HOSTS = ['dimensionalillusions.herokuapp.com','127.0.0.1']


INSTALLED_APPS = [
    'django.contrib.admin',
    'django.contrib.auth',
    'django.contrib.contenttypes',
    'django.contrib.sessions',
    'django.contrib.messages',
    'django.contrib.staticfiles',
    
    #CUSTOM  APPS
     'EHub.apps.EhubConfig',
     'EBlog.apps.EblogConfig',

     'EDashboard.apps.EdashboardConfig',
     
     'mptt',
     'ckeditor',
     'taggit',

]

MIDDLEWARE = [
    'django.middleware.security.SecurityMiddleware',
    'django.contrib.sessions.middleware.SessionMiddleware',
    

    'whitenoise.middleware.WhiteNoiseMiddleware', 
        
    'django.middleware.common.CommonMiddleware',
    'django.middleware.csrf.CsrfViewMiddleware',
    'django.contrib.auth.middleware.AuthenticationMiddleware',
    'django.contrib.messages.middleware.MessageMiddleware',
    'django.middleware.clickjacking.XFrameOptionsMiddleware',
]

ROOT_URLCONF = 'Dimensionalillusions.urls'

TEMPLATES = [
    {
        'BACKEND': 'django.template.backends.django.DjangoTemplates',
        
        'DIRS': [os.path.join(os.path.dirname(os.path.dirname(os.path.abspath(__file__))), 'templates'),],
        'APP_DIRS': True,
        'OPTIONS': {
            'context_processors': [
                'django.template.context_processors.debug',
                'django.template.context_processors.request',
                'django.contrib.auth.context_processors.auth',
                'django.contrib.messages.context_processors.messages',
            ],
        },
    },
]


WSGI_APPLICATION = 'Dimensionalillusions.wsgi.application'


DATABASES = {
    'default': {
        'ENGINE': 'django.db.backends.sqlite3',
        'NAME': BASE_DIR / 'db.sqlite3',
    }
}



AUTH_PASSWORD_VALIDATORS = [
    {
        'NAME': 'django.contrib.auth.password_validation.UserAttributeSimilarityValidator',
    },
    {
        'NAME': 'django.contrib.auth.password_validation.MinimumLengthValidator',
    },
    {
        'NAME': 'django.contrib.auth.password_validation.CommonPasswordValidator',
    },
    {
        'NAME': 'django.contrib.auth.password_validation.NumericPasswordValidator',
    },
]


LANGUAGE_CODE = 'en-us'

TIME_ZONE = 'UTC'

USE_I18N = True

USE_L10N = True

USE_TZ = True

STATIC_URL = '/staticfiles/'  


STATICFILES_DIRS=[         
    os.path.join(BASE_DIR, 'staticfiles')  
    ]


STATIC_ROOT=os.path.join(BASE_DIR, 'static')

STATICFILES_STORAGE = 'whitenoise.storage.CompressedManifestStaticFilesStorage'

MEDIA_ROOT =os.path.join(BASE_DIR, 'staticfiles/mediafiles')  
MEDIA_URL ='/mediafiles/'  


EMAIL_BACKEND = 'django.core.mail.backends.smtp.EmailBackend'
EMAIL_HOST = 'smtp.gmail.com'
EMAIL_USE_TLS = True
EMAIL_PORT = 587

EMAIL_HOST_USER = ''
EMAIL_HOST_PASSWORD = ''