I had to say it.

HERE IS THE TANK of WARFRAME.

I know that many people use [Rhino] by security and because they started the game with it but... i started with [Volt] and when i discovered [Atlas]... wow !

That's my last build, can be more performant with more forma because the aura is perfectible but.... i play with a [Stropha] (inate penetration) and its riven, as all my weapons, and that really enough for all the game, solo or public missions.

With this build, the real subject :

1-1389 armor so, 82.2% damage reduction on health.

2-1110 shield. To be hurt and having a sound as alarm.

3-1872 health. With the armor, and adaptation, you can be hit a long time to react, take a coffee, and back to your warframe with full energy.

4-health damage gives you energy with adrenaline.

5-you have energy to do and do, and do.... your 1-3 and 4 are always here if you take time to take damage.

6-your golems have 21444 health for 1847.5 armor, do 885 impact damage and last 69.75 sec. with my 1st arcane, 84 sec. They are a ennemy focus and let you breath.

7-your wall (2nd power) is nearby 15000 health, not reinforced by your 3. Use it to [Protect] targets (well placed), to entravean ennemies entry in ordet to focus on others (keeping an eye with the damage you can see on the wall on the screen, or barely to [Protect] yourself)

What to say more ? well... with the passive, i play with all anoying weapons that thow you out for a moment but surely the [Zarr], the [Ogris], the brahma, the [Sporelacer] etc.
I heal with my operator in void (magus reparation) and play madurai

Not a cheap build with 2 umbra but i did without for a long time, i prefer with. (to have umbra, radio misisons, 1 by campain, and teshin sometimes)

So, take that, adapt it to your gameplay and be sure, [Atlas] is the most polyvalent tanky warframe.

I did steel path mostly in solo (nobody was playing steelpath in this dinosorus era) with [Atlas]. The problem was with Kuva Fortress principaly and this was not this build (more weak), the [Zarr] wasn't existing, the malicious [Loki Prime] helped a lot.

PS : 1st power is fun but i don't use it, or exceptionnaly.
PPS : Sometimes you'll lose or die, as everyone and every warframe ;)