After searching for 2 days on Drupal.org without finding a good way to change the starting point of a serial field I almost gave up.

Then I found https://www.willhallonline.co.uk/blog/starting-drupal-serial-module-cert.... THANKS!!!

So to change your next number to 1000 do the following:

1. Find the table you want to change in directadmin it looks like serial_2aee03c42d982f20edbfedc568b10ba8
2. Use the follwing command: ALTER TABLE `serial_2aee03c42d982f20edbfedc568b10ba8` AUTO_INCREMENT = 1000
3. Clear all cache
4. Now create a node and the next number will be 1000

I am still looking for a patch that makes changing the number possible. Until then I settle for this.