Can i use amazon eventbridge to turn on an ec2 instance and run cron jobs

Hello.

For such use cases, it would be a good idea to set up an Eventbridge scheduler.
This can be used to start or stop EC2 at a specific time.
https://docs.aws.amazon.com/scheduler/latest/UserGuide/what-is-scheduler.html

The following blog describes the automation of EC2 outages.
Automation of EC2 startup can be set up in the same way.
https://dev.to/aws-builders/easy-setup-for-ec2-stop-jobs-with-amazon-eventbridge-scheduler-4lpg

If all you need is a cron job, just use EventBridge Scheduler to define the schedule. The Scheduler can invoke a Lambda function to perform the actual work. No need for an EC2 instance.