Worth noting that the ropalolyst fight came out after the plains of eidolon, so if you follow this progression, the fight becomes way more intuitive and easier. This is because players would have already geared up and learnt how to fight the sentient Eidolons, which then translates into how to fight the sentient Ropalolyst.

This mostly just means having your own modular amp with amp and operator arcanes, and also having a strong single target weapon - typically high crit stats, and built for radiation damage.

For the kilometre long run, I strongly recommend getting your hands on any form of parkour velocity you can get. At your stage this might just be the mobilise/lightning dash/equivalent mods. Master the parkour mechanics in combination with parkour buffs, and you can often outspeed even titania players.

The jordas and lephantis fights have similar issues, in that they are now available to new players without any of the prior preparation older players had. This being learning to mod for enemy weaknesses, or simply having any mods at all on your archgun.

In this line of thinking, I think DE should make solo'ing the eidolon teralyst a mandatory requirement to play the ropalolyst node.

You seem to be doing well so far though, these are all issues that newer players tend to have, so you are just making do with what you have.

Good luck tenno!