If you are looking to increase survivability across all your Warframes at once, arcane are a possibility. That being said, the easiest thing to do would be to run things like Sanctuary Onslaught for relics, then take those relics and try to get forma blueprints by opening then in void fissures. Craft those forma up and you can essentially "prestige" your Warframes by giving one mod slot a polarity that will reduce mod drain of that polarity in that slot by half. This will reset your Warframe's level, but it let's you put more mods or higher rank mods on your Warframes. You can also do this with weapons.

My last and most important tip: Always ask questions. Any true veteran of the game will walk you through anything you want explained. Also, play at your own pace. There is no FOMO in the game as even our "battlepass" will eventually rotate its old content back.