If you're a free 2 play, it all depends on your momentum (How much resources you used and gained, how much bouquets you ended with, and what floor you ended on, basically how much you can get done on limited resources with limited ways of getting them being cases for free), activity, how often you're successful in clearing floors and getting chances, and how fast you get your free slayer cards to 100 so your bouquets are maxed. This counts for everyone yeah, but paying players have a slight advantage here so f2p have to plan ahead to stay up with them.
For me, being one of those legendary(?) F2P players that made it to the top 300 rankings, finished all 200 floors the first day and getting 50k the next here's how it went for me:
Momentum: I had 30 Peronamins, and Half Peronamins going into the event, I made sure to set a minimum and maximum amount I'd use during the day to speed up my floor clearings but to also be sustained for the next day. My minimum was 20 and max was 30, and my pero radars was min 5 max 10. if I went below that by either using more to get ahead or using more because I fell behind, I would stop and scout pink cases, above that, I'd use as extra. Doing this speeds up your floor clearings and bouquets because you get more chances to do both but also have enough for the next few days packed if you somehow fall behind. I also set a goal to hit 25k by the end of first half, and splt up daily goals based off that. If I was behind on schedule I'd just rush it. Yeah. Seems stupid but you can't expect to hit 50k easily if you mess up. I was lucky and hit 30k (Bouquets from cases, gacha, achievement rewards, etc...) so it made it a hell of a lot easier. Ended on floor 100 day 3 into the event because I picked what spot I wanted to pick a majority of the time which was top left then alternating after consecutive missed tries, and it worked for me. Everyone has a different way of getting floor done, that was my way. So I spent that time trying to rack up any extra bouquets I could in the extra floors while waiting for round 2. I can immediately start round 2 on the right foot with decent materials and timing.
Activity: This sets me apart from others. Being on vacation, I can just get on here or pass the time by playing other games while my stamina fills up, making sure I used about 1000~ stamina a day, giving me more chances to get keys, more chances to get bouquets, and more chances to clear floors meaning more achievement rewards.
Luck: Extremely lucky, maximum amount of tries on a floor was 4 for me. After that I started getting lucky completing floors. I honestly didn't need as much luck as I received due to my overhaul of materials and activity, but it helped. The bouquet chance was more consistently getting 50s and 100s. Rarely do I ever get a 300. But that consistently starts showing once your prize gets closer. I would also say having friends who paid for gold and silver keys was also lucky because along with this, my contents were lucky, giving me radars and namin/pudding majority of the time. So sustaining myself wasn't a problem.
Got the slayer cards to 100 the moment I started playing due to how much Pero I saved up.
So overall just plan ahead and make sure you do well in the first half. That'll then tell you if you're on track, or need to speed up/have breathing room.
Note: Lots of planning but I don't care what it is, I always have a plan. xp
Also getting a good rank isn't all that's cracked up to be now that I think about it. Seems like a huge gap between the 300s to top 10 so our bouquet totals seem scattered all over the place. Makes me realize that if it wasn't, my bouquet total is actually bad.