Some generic advice:
Just downloading and running exploits won't do any good, you need to do a proper enumeration of your targets.
Some things to look for:
- Check which OS in which version is running on which kernel version
- Check the environment variables
- Check running services, their version and under which user they are running
- Check if any 3rd party applications are installed/running
- Check config files, scripts, databases, logs etc. and look for credentials, misconfigurations etc.
- Check if any jobs are scheduled
- Check if you can sniff any further network traffic
- ...