If you want to upgrade the old version of Drupal to the latest Drupal, please contact us as soon as possible. We also help to migrate other CMS to the latest version of Drupal. 
Drupal 7 and Drupal 8 end-of-life will be in November 2021.  Drupal 8 depends on Symfony 3 and Symfony 3 has an end-of-life date in November 2021.
This year is crucial for all Drupal 7 and Drupal 8 websites. Website owners must think about the upgrade to avoid data loss and hacking. Upgrading from Drupal 8 to 9 will be far easier than previous major version upgrades. The primary goal of the Drupal 9.0.0 release will be to remove deprecated code and update third-party dependencies.
By keeping your Drupal 8 sites up to date, you can easily upgrade to Drupal 9.