Hello:
I made the post that was referred to and I have some comments that may be applicable here. First, I would say that the beginner challenge is at least as competitive if not more than the advanced. There is a substantial variation in team strength in advanced, whereas there are a lot of fully leveled beginner teams. I had a mediocre beginner team that got trashed because my healer was not leveled, and I dropped to 10,500 or so at the end. I was too occupied with other things to do anything about it 
As some of you said, there is no timestop or tornado in the beginner, but most people don’t have more than a few of those. Timestop doesn’t work on the boss monsters in advanced anyway, I tried 
The five tornados I used were accumulated over many months in the game, and I have none left. Since I am not at level 19, there is no way I can use that trick again without leveling up.
Finishing #37 in that big of a pool is great, and it looks like you were only about 30,000 from the top. You didn’t even use many flasks, so that is a great accomplishment. If I had to guess, you lost a few points from the first few levels by not churning them. I looked at the top teams, and many have Brienne. It is likely that these teams had a bit more attack power, finished the levels earlier, and that is where your lost points are. I suspect that levels 7-10 on the top few teams would be where most of the 30,000 extra points are distributed.
I’ll bet you have some techniques that could come in handy for some of us.