Well "hot zones" aren't the same as live.
The well trodden path where you'll always find people are...
Crushbone
Unrest
Mistmoore
City of Mist
Karnor's Castle
Sebilis
In that order. For an ogre you can probably substitute Crushbone for some Upper Guk (or North Ro/EC) > Oasis before hitting Unrest.
If you head to Kunark...
16-20 Kurn's Tower
20-30 Lake of Ill Omen (if you can find groups, just need a healer to get one started)
(or) 20-29 Warslik's Woods
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