From your tag, I'm guessing you're using Lightsail.
It is easy to introduce AWS WAF for BOT countermeasures.
However, Lightsail does not provide the ability to use AWS WAF directly.
You can use snapshots to migrate from Lightsail to EC2.
Alternatively, you can use the following link method to host the ALB + WAF in your default VPC and use VPC peering to forward traffic to Ligthsail.
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