I’m fairly new to Warframe, only MR 6 with a few weapons maxed (and sold) and just now making Rhino as my first new frame. I have been working through the star chart and completing quests as I got them.
In my adventures I have encountered some opportunities to grind for certain things. Reputations with the syndicates, rewards from Fortuna or the the happy family in Deimos, or that frame you can buy from Duviri wyrm kills etcetera. But how do I know what is worth going for?
I don’t necessarily want to rush to end game ASAP, but I also don’t want to spend time grinding for something that I would very quickly replace anyway
Do what you want. If you like the Solaris and you think the missions are fun, do Fortuna. If you don’t, leave it for later when you have better gear that can do it easier. The only thing that’s a must-do is progressing the star chart and the main story. There’s plenty of content you can be happy never touching. Maybe one day a new update will come out and they’ll add something you want, and you’ll do that content then. Maybe they won’t. Follow your interests.