Hi there, new to Run it once but not to Poker, took a break

Just qualified for the Sunday Million for the first time ever, (usually play at low to mid levels but never more than say $50 dollars entry both live and online).

Not sure if this is the right space but wondering what kind of tips you'd give for a first time player in that tournament or anything you have experienced playing in that tournament.

My history is probably quite common, used to play Poker a lot in 2003-2009 both live and online (even did my final MA journalism project on it) but life took over and have been getting back into it both live (in London, £50 stakes max MTT) and online.

Apologies if this is not the right forum - have searched using sunday million but thought I'd post.

Thanks and gl