Order of quests after Rail Crossing

[ccsonic]

Hey guys!

So this probably has been asked quite a few times but I didn't know how to look for it really...

Currently I'm level 14 with a energy pistol crit build and not sure what quests I should do now. Went to Core City and finished the Gorsky quest line.
Earlier I tried to do the first Protectorate quests but always was oneshot I think.

Could any of you give me some advice whether I should stay in Core City to do oligarchs quests/gauntlet/arena or maybe go to Founrdy to do some stuff there?
It's just that I don't want to go too deep into a quest line and then abandon it due to lack of survivability.

Thanks in advance for your help!

[Fenix]

Logically Foudry located between Core City and SGS, so looks lke its should be easier.

[ccsonic]

Okay, also read that but I was so hesitant in doing so because there was absolutely thing that leads me there.

So Foundry is just a city with sidequests? Mainquest just still leads me around Core City.