Upper Guk at 25 near lower zone line is pretty good at 25 very nice ZEM. You either need ring of shadows or to fight your way back but going to the live side zone in Upper Guk was usually less crowded than near the dead zone line with a decent amount of mobs.
I would also recommend Sol A Goblins. Another zone with great ZEM with active groups but also mobs to solo while LFG. Did quite a few levels here.
Unrest also has a great ZEM but not a vey big zone and if you can’t find a group I don’t think there is much to do.
I did try ToFS at 30 and didn’t really like it. Don’t think I ever got a pickup group and only rarely found someone to duo with on the first floor. Also annoying the Boss/Key mob can pop from anything you kill and is lvl 34 I think. Annoying to have to zone him if you are solo. Also, quite a few pulls you’ll need to pull which if they go bad cost a lot of mana or you have to zone.
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