If you server is not starting check the following this.

/home/steam/valheimserver

cat /home/steam/valheimserver/start_valheim.sh

If your configuration file is jacked up, then you can fix it with:

vi /home/steam/valheimserver/start_valheim.sh
or
nano /home/steam/valheimserver/start_valheim.sh

Will not work:
./valheim_server.x86_64 -name "My Awesome Server" -port 2456 -nographics -batchmode -world AwesomeServer -password awesomeserver -public 1
./valheim_server.x86_64 -name "My Awesome Server" -port 2456 -nographics -batchmode -world AwesomeServer -password 1234 -public 1
./valheim_server.x86_64 -name "My Awesome Server" -port 2456 -nographics -batchmode -world AwesomeServer -password 123 -public 1
./valheim_server.x86_64 -name "My Awesome Server" -port 2456 -nographics -batchmode -world AwesomeServer -password 12 -public 1
./valheim_server.x86_64 -name "My Awesome Server" -port 2456 -nographics -batchmode -world AwesomeServer -password 1 -public 1
./valheim_server.x86_64 -name "My Awesome Server" -port 2456 -nographics -batchmode -world AwesomeServer -password 1 -public 1
./valheim_server.x86_64 -name "My Awesome Server" -port 2456 -nographics -batchmode -world AwesomeServer -password (NO FREAKING PASSWORD!!!!) -public 1

Will work
./valheim_server.x86_64 -name "My Awesome Server" -port 2456 -nographics -batchmode -world AweWorldServer -password SuperDuperPass12 -public 1

Check your resources for your VM:

You must have 2CPUs and 4GB RAM (you might get it to work with less but it will not last very long)

Check our other troubleshooting steps:

https://github.com/Nimdy/Dedicated_Valheim_Server_Script/wiki/Top-10-Reason-your-Server-is-not-working-and-how-to-fix