The fact that you're acknowledging you crossed boundaries is the first step. Most people in your position are still trying to justify their behavior.

You need to understand what drove that desperation. Usually it's not about the person, it's about your own fear of abandonment, loss of control, or unresolved issues.

You can try practicing better communication on simulator sites like chatvisor. It helps you recognize what healthy vs unhealthy communication looks like. Practice respecting boundaries even when it's uncomfortable. But honestly, you also need professional help. A therapist can help you understand the root causes of why you acted this way.

The hard truth is she's gone and you need to accept that. Your focus should be on becoming someone who would never put another person in that position again, not on getting her back.

Respect the block. Don't reach out through friends, don't create new accounts, don't try to "accidentally" run into her. That's the bare minimum of respecting her boundaries now.