So im going to change into a different race what should i pick ??
Im currently a Vygoid Excavator

Mylarai Fixer haha

actually any of the planet enriching races are great, also drannik would be a good second choice

Okay, it really depends on what you want to do.

PvP
Races: Konqul/Aerlen/Lazuli
Profession: Excavator, Fixer

NPC
Races: Drannik/Konqul/Aerlen/Lazuli
Profession: Fixer, Excavator

Mission
Race: Inergon/Vygoid
Profession: Any

Rank Fast
Race: Human/Inergon/Drannik(NPC)/Konqul(NPC)
Profession: Any.

Invade
Race: Konqul/Zolazin
Profession: Fixer, Saboteur.

Help Legion
Race: Zolazin/Genetarr
Profession: Saboteur.

Bit of everything
Race: Sillixx/Vygoid/Kronyn/Mylarai/Taltherian
Profession: Any.

~

Did I miss anything?

Builder is always an option for if your struggling with upkeep. Also the enriching races are good no matter what you want to do.