Quick fixes first, then how to get help.
Restart and pick the second entry in the start-up menu. You are back on the version before. See Updates and going back.
Click the network icon on the taskbar and pick your Wi-Fi. For a cable, check it is plugged in at both ends. System Settings, Wi-Fi & Networking shows more. See Wi-Fi and home network for step-by-step fixes.
In the Portal, Troubleshoot has a button to stop stuck Wine and Proton games and to reset Steam.
If you set up security questions, click Forgot your password? on the login screen, then click it again to confirm. The computer restarts into a reset window: answer your three questions and choose a new password. Your files and apps are untouched.
No security questions? Another administrator on this computer can set a new password in System Settings, Users. Set up your questions any time from the Steel OS Portal, Welcome tab, Security questions.
A disk-encryption password can't be reset by anyone. Keep it somewhere safe.
Go to steel-os.org/report. Say what you did, what you expected, and what happened, with a screenshot if you can. These details help:
sudo bootc status in the terminal (Super+Enter).