I send 100 messages every hour to my gmail accounts I own, and I reply to them automatically.
Is this the way I can raise the reputation of my domain
No, sending 100 messages every hour to your Gmail accounts that you own and replying to them automatically is not a good way to raise the reputation of your domain. In fact, this practice could be seen as spamming and may actually harm your domain reputation.
Instead, focus on building a legitimate email list of people who have opted in to receive your messages. Send relevant and valuable content to your subscribers at a reasonable frequency, and avoid sending too many messages in a short period of time. Additionally, make sure your emails are properly authenticated and comply with best practices for email marketing, such as including an easy way for subscribers to unsubscribe from your emails. These practices can help you build a positive reputation and increase engagement with your subscribers.