Necros are generally not sought for groups, but its because they're undervalued and not enough necros play properly in groups they do get into. Make friends and l2necro and you'll find groups as one.
Necro and ench can both afk pretty safely whenever when solo, necro via feign and ench via knowledge of safe spots/spawn times and the ability to move around anywhere. Ench isn't as easy to afk with in groups without maybe bothering the group, since you are so crucial for cc and your charmed pet can be an annoyance when you need a break.
Wiz is a long, slow trip, imo. Quad kiting playstule and downtime needs to be a good match for you, since you will get the vast majority of your xp that way unless you have friends who pity you and give you groups
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Magician are more of a 1 trick pony. No innate invis, ivu, cc, lull, feign... Totally reliant on power of and vulnerable to the weaknesses of their pets. Strong in groups and useful in a niche way in raids though, as much so as necros or ench I guess.