The only people that are gonna have issues are those that have unfinished grids and run around on a lower powerlevel (sub 30k). After Floor 5 the difficulty ramps up quite a bit and you can have yourself locked away from progressing.

People with like 40k and more and a solid Grid will progress further but may be having trouble at around floor 10 - 11 as it goes up a good notch again there. This is kinda the goal to reach with the hope to rank inbetween 351 - 500.

If you manage to complete floor 11 doing all quests until this point and rank between 351 - 500, you gain 10k+ points in total (6650 from quests + 3500 from ranking), but it may take some effort.

My first attempt on Tower was on the Thunder one with a 25k team (and lower cause of using R Hime for other floors because of the lockout-mechanic of used hime) and I managed to get past the first boss to Floor 6, which was the end of the road for me. Couldnt get further at this point as I was just to fresh and hadnt anything to really work with in there. Still, I got over 3k medals in total and could get me something.

Most important just is: Dont rush things.