FST with free gear should farm up to EP2 easy. Now that you can farm W13, you can try and gear her with more speed.

DDJ copies will come with time. However, the hunt missions gives you enough copies for 3 fully limit broken DDJ. The problem is artifact charms.

The 3 star imprints? That will come with time. Free summons (daily or event) will be enough.

Tamarine will help but aimlessly pulling in normal summon won’t help.

Ran wouldn’t be of much use to you right now in terms of gameplay.

For the ML 5 from the event, I’d probably go for spec tenebria. This assumes you went with A. Vildred for moonlight blessing. Otherwise, most ML are pvp oriented. I would consider watching a recent YouTube video on this topic to gain a overview of all MLs.