Thanks for the info. The processes running on your machine look ok to me. There's not too much load on it. Could you please run the commands below to check the disk space?
sudo find . -type f | cut -d "/" -f 2 | sort | uniq -c | sort -n
du -h -d 1
For the plugin issues, I see the error message is shown multiple times in your Apache error log file. I think that the database wasn't imported correctly. Did you have any error message the first time you tried the plugin? You says the process never ended, but did it give you any error? Did you get any error in any of the others try? If you are importing a big site with many plugins, images and themes it is possible to require some extra time.
Could you please try starting a new instance, increasing the PHP max execution time and then trying to import the content from your original site using the WP Migrate plugin?
To do so, edit the `/opt/bitnami/php/etc/php.ini` file and increase the value for the `max_execution_time` parameter. You can try with a long value such as 300 so it will wait up to 5 minutes before giving a timeout error. Also restart services after modifying the `php.ini` file for changes to take effect:
sudo /opt/bitnami/ctlscript.sh restart
Hope it helps,