[YendorLootmonkey]

The closest you'll get to soloing efficiently at a high level is probably between level 40-45, soloing lancer swordfish in Kedge Keep for fairly good XP. But they nerfed the ZEM there, so I don't know how it is anymore. Well-twinked, you could probably hold your own in Sol B and L Guk against non-casters.

After that, your best bet is to stay outdoors in order to have plenty of room to kite/snare/root/dot/flee... so you'll have to go to Kunark. And shit there just hits way too hard for straight up melee, so you'll have to resort to arrow kiting or root/rot. If you choose the former, as said above, you absolutely need a Tolan's Bracer to make this effective. If you choose the latter, do yourself a favor now and work on your Conjuration skill with Dance of Fireflies every chance you get, so you aren't fizzle x 20 when you finally get Drones of Doom.

Once epics come out, things will be a bit better in the solo department with 40% item haste and 50% slow proc. If you're able, get a Dark Cloak of the Sky once the Sky upgrades happen for 50% spell haste. I would imagine that'll help your solo prospects quite a bit.

Otherwise, you're honestly better off finding a class that can cast Fear, and duoing for near zero downtime... it'll be worth the XP split over a long time horizon.