Frost is probably the lowest dps spec for a mage.
The replenishment is nice for sure.
And they're relatively easy to macro (Frostbolt and Water Elemental).

If you'd like to continue to have one in your team, consider an Arcane spec.
Like Fire, it is a lot more dps then Frost.
Unlike Fire, there aren't constant procs to watch out for (and which if missed hurt the dps a ton).
Arcane would go 4x Arcane Blast and 1x Arcane Missiles.
Not taking the last point in Arcane, if you want 21 elsewhere is decent since you're not using the spell in the dps rotation anyway.
IMO, Polymorph is a wasted glyph. Aside from PvP (which you're not doing), you don't really need the spell much.