I finally found a solution that fixed the resolution issue after upgrading to Ventura and losing my high resolution display options for my Dell 3008WFP with a default resolution is 2560x1600 - it still has a great image.
In Ventura, the new Display settings only show 1920x1200 as the maximum size, and the old hidden option to show higher res display sizes is now gone...
1) To fix the issue, search for the display preferences file on your Mac by opening a new finder window and typing Command+Shift+G. A popup window will appear with a text entry line.
2) Paste this - /Library/Preferences/com.apple.windowserver.display.plist - into the pup-up window and hit return. It'll take you directly to the .plist file in the preferences folder.
3) Delete the com.apple.windowserver.display.plist file.
4) Make sure your monitor is plugged into the computer and restart. I surmise that this may help Ventura adopt higher resolutions that are provided by the monitor to the computer.
After restart, my native Dell monitor resolution of 2560x1600 shows up in the Display preferences.
*Please note that that if you're using an adapter cable from USB-C to HDMI with a MacBook Pro S1 or S2 to a previous generation monitor like the Dell, you'll max out at 1920x. After extensive head banging, it appears that previous generation monitors like my Dell are equipped with HDMI 1.0, but HDMI 2.0 is required for higher resolutions.
Instead of using an HDMI connection, I purchased a USB-C to Display Port cable, which allows me to use the higher native resolution of 2560x1600 without any issues on the older Dell.
I hope this works for you!