I've seen career changers fail in predictable ways:
Applying too early: Sending applications before you can pass a phone screen wastes opportunities
Ignoring networking: Cold applications convert in the low single digits. Referrals convert -x better
Over-preparing: Waiting until you feel "ready" means waiting forever
Hiding your background: Trying to look like a CS grad instead of leveraging your unique story
Targeting only FAANG: Large tech companies receive millions of applications annually. Start with companies that value non-traditional candidates.