Zend certified PHP/Magento developer

Lightsail instance unreachable after running setup:upgrade during theme install

I have Magento 2.4.3 on an AWS Lightsail instance (bitnami packaged app). I added a theme in under app and pub as instructed and ran php bin/magento setup:upgrade. Started fine then evidently seized up while updating modules. I came back 15 minutes later to find the ssh session was automatically killed.

I can’t access the host now. I was prepared to reboot the host from the lightsail interface but wanted to hold off in case setup:upgrade was actually doing something meaningful. Obviously no way for me to tell now (and I wasn’t running in verbose nor have access to the logs unfortunately). Can anyone speak to this? I’m new to magento so entirely possible if not likely user error. Thanks