Currently my class is:
Wizard > Pyro > Linker > Pyro > Linker
What are the suggested builds that I can take since I took the 2nd class Linker. Did I mess up or is there another way? I solo/quest in between dungeon-recommended levels. Thanks! 
You could fit in necro2 or sorc2 nicely, for some more survivability and damage from summons and some other utility or support spells. Otherwise, if you want that rank 7 choice for WL/FF, you could spend a single circle in sorc/necro or even grab pyro3 as the rank 6. Your build seems not strictly focused in a role, but it’s definitely not useless, particularly as a solo class outside of parties.
I would reroll, but if you dont want it, i would go either for sorc2 or pyro3link3.
Sorc 2 nicely synergises with linker and pyro2 is nice also (though cryo would be better imo)
Pyro3 - have “viable” dmg output for later lvls - linker3 will always be needed in parties.
you should be fine with pyro 3 > linker 2 > warlock
you can prioritize linker 3 over pyro 3 if you are more party oriented but
the total dot/dps output you can have from fireball,pillar, flameground and pole of agony seems good