HI there, if you do remeber your email address and also your phone number thats associated with your Apple Account
Visit here: https://iforgot.apple.com
Reset your password
and since your account was locked by Apple for potential suspicious activity, you may need to get in touch with their support team and just like explain the situation, and they can help verify your identity to unlock the account.
but if you did factory reset your iPhone, you may have triggered Activation Lock, which requires the Apple ID and password used before the reset.
#Apple account lock
rustic crow
Theres not much i can do on my end as if it was locked by apple, your best bet is contacting them to get back your account. As we do not help in account recovery.
You could always check here to view more support info: https://getsupport.apple.com/products
You could always contact them by phone as well they have a number thats avilable to call
OR if you have an apple store near you, you can schedule an appointment or walk in to get help in person. Bring identification and proof of purchase for your device