Maximum Reverb Sound Effect -
You don't need to be making ambient music to use this technique. The maximum reverb sound effect works best as a dramatic accent.
If you want, I can: (A) provide specific parameter presets for a target plugin (name the plugin), (B) create step-by-step settings for vocals/drums/guitars, or (C) generate a downloadable chain you can paste into a particular DAW — tell me which option.
Instead of putting reverb directly on a track (an insert), use a 100% wet Aux Send. Then, equalize the reverb return.
Why would anyone want a reverb tail that lasts 30 seconds? The application goes beyond just "making it sound big."