There should be a mentor system in Warframe.
An entirely opt-in system where experienced players (maybe MR30+) can choose to become mentors for new players who choose to have a mentor.
This is something that needs to be heavily advertised to new players while still being a choice. It shouldn't be forced on anyone because then no one actually willing to help will do it.
It should be accessed in its own menu with a chat function for the two players to be able to communicate in-game. Preferably a mail-like system that allows for offline messaging so new Tenno can pose questions to their Mentor even if the Mentor is offline.
There should be some incentives that make it an attractive option for high experience and new players alike, maybe even a few cosmetics.
Although any exclusive rewards need to be available for both new Tenno and Mentors to obtain, otherwise it would be unfair to existing players and people who choose to skip the system early on.
I honestly think a mentor system would help the new player experience feels less isolating, it'd help to combat misinformation that spreads throughout the community, and would serve as a good guide for new players looking to catch up to the current game.
Please feel free to comment any add-ons to this idea!!
Sincerely, Irri - a very passionate Tenno