Game Stuck on Launch

1.reboot router

2.Changing your DNS settings may also solve the problem. Here's how to do it depending on the type of device you're using:

For PC users, go to Control Panel > Network and Sharing Center > Change adapter settings. Right-click on your network connection and select Properties. Select Internet Protocol Version 4 (TCP/IPv4) and click Properties. Use the following DNS server addresses: Preferred DNS server: "8.8.8.8", Alternate DNS server: "8.8.4.4".
For console users: On PlayStation, go to Settings > Network > Set up your Internet connection, select Custom and select your network, set DNS settings to Manual and enter the same DNS server addresses as above.
On Xbox, go to Settings > Network > Network Settings, select Advanced Settings > DNS Settings > Manual, and enter the DNS server addresses as above.

3.Disabling fullscreen optimizations can also help. Go to the folder where Apex Legends is installed, right-click on the file "r5apex.exe" and select "Properties". Go to the "Compatibility" tab and check the "Disable fullscreen optimizations" option. Click "Apply" and "OK".

4.Clear Steam Cache. You just need to follow these steps to easily clear the Steam cache on your computer:

Open the Steam Client application on your computer.
Launch the Settings Panel by clicking on Steam and then going to the Settings section. This is located at the top left of its client menu.
In the Settings panel, you have to select the Downloads tab. After that, click on the option that says Clear Download Cache. It is located at the bottom of the panel.
Press OK to confirm the cache clearing process. After that, you will need to log in to your Steam account again.

If none of the above solutions worked:

You are playing on Steam, try launching the game through the EA app.