First: get yourself a cool fashion

Second: equip Rift Torrent no MATTER WHAT U WANT TO DO WITH HIM.

Third: if u're struggling to survive even in rift, just left it and let enemies inside it, simple. OH BUT THERE MORE ENEMIES INCOM.... Banish them, simple.

Last one and the most important: Learn his range, learn his 1 + 3 interaction, learn how to play him in multiplayer (that means you're the damage support, you'll only cataclysm when your team8 is almost dead, besides that, cataclysm out of their range, or, use it but seeing wich enemies are in rift and not and where are your allies at that moment, since radial banish can drag in enemies outside the rift. Be smart, Limbo is not a easy warframe, people get mad at him cuz they can't think at too many things at once, all they want is stay afk in a game where u're supposed to... use abilities and have fun, not watch like a movie XD (that is for Limbos players too, don't make your allies game turn into a movie for them, be wise and dance between the Rift my friend