We have checked your server via support ticket and found from the CRON logs that memory limit set for your PHP is 32 MB while Magento needs 2 GB. Hence the cron jobs are not working on your server.
Memory limit 2 GB is a requirement for Magento 2 hence even if we provide Magento 2.3.3 it wont work. Once the memory limit issue is fixed Magento 2.3.4 will also work fine.