Migrating to AWS Lightsail
As per the title my 12 months free tier usage for this AWS account has expired. As this website would cost me around $60 per month, I decided to migrate to AWS Lightsail, with prices starting at a more attractive $3.50 per month. Thankfully I had billing alerts configured to warn me on the increased spend.
I had some configuration to do in terms of the site, enabling HTTPS, assigning a free static IP and updating Route 53.
Once I was happy with the migration, I took final backups from the old architecture including a final snapshot of the RDS database instance before deleting the resources.