It was too easy to complete, but equally you don't want to make it too much harder otherwise less people will attempt it. I would suggest a rapid drop off in xp for your daily wins, maybe 150 for the first, then 50 for 2 and 3, then maybe 25 or even fewer after that. It means that you can reasonably finish it with 2 wins a day, but if you want to finish it fast you need to really grind out the xp. Maybe fewer quests as well, like 2 per day or something, though if you were going to do that then the xp rewards would probably need to be higher. Basically it should be not to just taxing to finish if you play a few games most days and possible to grind out faster.
The flux rewards were laughably low the entire pass for all 3 levels didn't even give enough to forge one common card up from meteorite to diamond. You give away 2500 for 7 wins in sealed. How about a few of those in the various tracks. I'm probably in the minority, but not alone, in being forge limited by flux. You want people to forge, it's gods to you and cards burnt. Literally a win in all aspects from the GU side, please try to remove as many barriers to this as possible! Actually to remedy this you should add a level 41, 10k flux, go on, you know you want to!
It shouldn't stop at 40 levels. Sure, have the main prize there, but keep going to infinity if people want, maybe just reward flux stars and core packs, idk. Also, for the love of God, please let us buy the welcome cards we want with stars, it will encourage forging and marketplace activity which is good for you, and it will let us get the cards we want. There is literally no downside, and if you reward lots of stars in the post level 40 things will just keep flowing. Maybe you could include forge tokens or something, give a free one off use of the forge.