You'd have to write a plugin which recorded when each user logs in, then cleans up any user who hasn't done so within your threshold of 3 months.
You could either implement a ServletFilter or just create a component which listens for the RequestStartedEvent to record who is logging in. You'd not want to do this on every single request however as it could effect performance.
Then in a scheduled job, use the PermissionAdminService#revokeAllGlobalPermissions(com.atlassian.stash.user.StashUser) method to remove access for any users who haven't logged in.
Bitbucket Pipelines helps me manage and automate a number of serverless deployments to AWS Lambda and this is how I do it. I'm building Node.js Lambda functions using node-lambda ...
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