This honorific title is unofficial and only exists on Lichess.
We rarely award it to highly notable players who are good citizens of Lichess, at our discretion. You don't get the LM title, the LM title gets to you. If you qualify, you will get a message from us regarding it and the choice to accept or decline.
CT - to be fair, he's not asking for the title. He's just speculating about who might possibly be considered worthy and offered the title.
It's like speculating who is going to be amongst the next crop of people to be knighted by the Queen, except Lichess Master is a far more prestigious, mysterious and sexier award than a simple 'Sir' or 'Dame.'
@EmmettK Jefforever already has an FM title, so I don't think they would give it to him. @tourdivoire That would be awesome, but unfortunately he is not high rated enough (it's hard to believe that when he is 2100, but most LMs are rated at least 2200 rapid if not more.)