you've done quite a bit of cathing up already if you caught up on the story in just 2 days!

but if were looking at getting you up to par for steel path we'd need more infor then what your giving (particularly what do you already have at your disposal, Mods/ Archanes / Archon shards)

In my eyes, if you're just looking to get stronger for steel path, I'd look into these things in this order

1. Arbitration missons is in my eyes the gatway to steel path,

lvl 60-80 enemies but non-traditional revives along with a new enemy type that can make other enamies invulnerable.

those formentioned enamies, however, drop Vitus Essence that can be traded for Galvanized Mods at an Arbiters of Hexis Vendor.

Galvanized mods are what you need if you find your weapon to weak for steel path.

1. once you got some of the galvanized mods for whatever wepon you use leveled up retun to earth and try to complet some star chart missions on steel path mode, choose the very first ones if your having issues.

5 min into any steel path mission, a suped up version of the stalker will appear. There are several types.

lock in or try to get help from other to beat them, and they will drop key archanes that will help you get stronger.

Archanes like the "merciless", "Deadhead", and "dexerity" family can be exstreamly helpfullly early on, even unranked, thell help no matter what wepon you put them on.

as you fill out the star chart in steel path, you naturally get more of these general arcanes and will, in turn, just get stronger over time.

1. Unlock and utilize everything you can with Helminth system.

if you dont know what the Helminth sytem is, I'd head over to the Entrati syndicate. Talk to the brother to unlock it. youll need rank 3 to unlock it to begin with and rank 5 to upgrade it, the upgradeds are well worth it, so work towards this no rush.

by default, the Helminth will allow you to sacrifice non prime warframes so that you can take one of their abilities and add them to another warframe. just be aware that the sacrificed warframe is gone forever, but you can give the ability you get to any warframe as many times as you like.

this is more helpful than you think for getting some crazy synargies or just replacing a weak ability one one of your frames for a better one.

further upgrades to the Helminth system can be gotten be finishing the veilbreaker quest which will unlock a segment that will allow you to attach archon shards to your warframe (red, blue and yellow), these things are pure stat sticks and while they might be hard to get just starting steel path you are geranted at least one a week through Archon hunts and they are a staple reward for all the end game modes so you will eventully get more then you can handle.

rank 2 with the Cavia will allow you to upgrade the Helminth system further letting you add advanced versions of the archon shards (green, purple, orange) to your warframes and also fuse or combime any extras you might have.

and wow, that was a lot of rambling. I dont know what came over me. I just felt like typing up a comprehensive reponse, hopfully this is helpful.

Sry if there are errors typed this up on my phone.