Search the path of actual installed packged detination. After that copy and run like below command.
which npm
which node
which pm2
sudo ln -s /home/ec2-user/.nvm/versions/node/v16.15.1/bin/npm
sudo ln -s /home/ec2-user/.nvm/versions/node/v16.15.1/bin/node
sudo ln -s /home/ec2-user/.nvm/versions/node/v16.15.1/bin/pm2