Thank you for contacting us. Your Training Subscription Seat is indeed valid until Oct 2021 but what you may be referring to is your Elastic Cloud Subscription. You had a trial account that seem to have expired.
Cloud Trial Users can extend via the console when their trial has expired. Click on the trial badge at the top right corner of the console, where the text reads
Trial expired. Then click 'Need more time' and follow the instructions to get a self-serve extension. This will add 7 extra days to trial. This option is only available ONE TIME.
Please note, after one extension, the trial period will end and it will ask for payment information.
If you would have any more questions, please contact us at email@example.com so that we can assist you in the most timely and accurate manner.
Have a good rest of the day!
Elastic Training Operations