Not really sure but my samsung s3 can turn on by leaving the cable in to charge.

I'm pretty sure this one will work if you have the 44mm model: iFixit and this one for 40mm: Apple Watch (40 mm Series 6) Adhesive Strip (ifixit.com)

Click "forgot my password" and sign in with your Gmail account. Ooorrrr, you could hard reset your phone by turning your phone off, then holding volume up and power at the same time, and click yes to reset device. Let me know if there is a better way! Have a good day!