The Necro would fit your criteria well, but I'll play devil's advocate for sticking with the Druid, at least until you get the mid 50s.
1) Druids are also very casual friendly. Ports help a lot for this. You have a variety of ways to solo, as well. Root rot, charm, quad are all viable.
2) Druids got a LOT of benefit out of Velious in terms of spells and gear. They arguably improved more than any other class. They have the best Velious BP clickie, two nice new heals in Chloroblast and Nature's Touch, one of the best buffs in the game with PotG, a bear pet, plenty of good charming zones in Velious, an indoor stun, a nice ATK debuff, Tunare root necklace and DS clickie gloves from PoG, and finally the Druid Epic is now much more useful since root and snare stack, and much easier to get since Venril Sathir can be spawned directly.
Necros, in contrast, got shafted pretty hard by Velious. They get a couple of nice items like Zlandicar's Heart and Holgresh Elder Beads, but otherwise don't benefit much at all.
3) A Druid is always useful for making easy plat from porting, powerleveling or just running around looking for rare mobs/mob cycles with track. Just a very good generalist and casual class.
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