I don't really think this is a smart Idea. At least the way you have things set up currently. Conceptually I find it to be quite nifty and pretty reminiscent of steam humble bundles. However the current mentality behind the picks and the restrictions for list entries is pretty counterproductive.
The main Issue I see is the subjectivity in the picking process. Now don't get me wrong I am not here to whine about a show not being on there but if have understood things correctly you want this to be a gate way into anime so to speak both in the hobby and in the communal sense. If this is indeed the case then the selections you have really seem like they are only there to indoctrinate new people into a community you want them to be in rather then serve as an introduction into the medium. I realize that sounds a bit ridiculous but allow me to elaborate. A show like Ping Pong for example isn't very good as a jumping off point. With its unique ( not bad ) art style and rather nuanced outlook on it's subject matter it is only something that can be fully appreciable to someone who knows that this is breaking convention. Otherwise the show is a simple story about ping pong and loses most of it's impact past the visuals. So suggesting to someone that this is a good starting point simply because you believe to be really personalizes the recommendation. Which isn't an inherently bad thing I make recommendations for shows I love all the time and express that I indeed enjoy them. However if you want this to be "something an average thoughtful person in their 20s would enjoy" you need to be more varied in you choices when creating a pack. And when I say varied I don't just mean have different genres or wacky art styles. I am mainly referring to the "quality" of the show. The pack you have shown is a lot of "high quality shows" which again are not things that are fully appreciable to someone who is new to the medium and hasn't been able to formulate there tastes yet. So instead of having a bunch of critically acclaimed masterworks all thrown in one pack consider putting a couple middle of the road shows as well as one or two "great" shows. This variety will allow those who use this to really hone in on what aspects they like and don't like. Alsothis will not only give you as the person maintaining the packs a lot more reach when it comes to the shows you can put in since there are a much bigger pool of middle of the road shows then there is of absolute classics. But it will also help to get people into community involvement since most large communities are based around "trend shows" which tend to be more middle of the road then 10/10 masterpiece type shows.
This brings me to the second big issue I see with this and that is the restrictions you have placed on the selections. I personally think that having a 5 year window for something like this is actually smart. It creates a general idea on what the medium is like within that time frame allowing for the process to stay relevant as the anime landscape is always changing to some extent. However while this may be pretty relevant to TV series movies are quite different as unless they are part of a franchise that is ongoing like the Kizu films they are pretty stand alone and aren't as affected by the same things tv series are so going at them with the same mindset isn't very wise. The episode limit per season is also pretty curious since since it is rare to see a season be longer then 24 episodes in the first place especially nowadays. Now I don't have a full grasp on the type of packs you want to make nor do I know if this pack you have shown has specific theme or not but I think you should not have long running multi season things as part of a pick up and go pack type system especially when there is still a chance the they will continue to air like Monogatari, Haikyuu and Natsume. Instead focus on shows with 1 maybe 2 seasons and don't go above 24 episodes. Since it is unlikely for new viewers to want to invest a lot of time into a medium they are not familiar with. You also have to take into consideration a lot of new comers to the medium mainly consume media through their native language so telling a new comer to watch something like Monogatari which is extremely dialogue heavy with quick panel transitions and to my knowledge only has a subbed version will be a seemingly monumental task which they have no incentive to partake in. Again I don't if this pack has a specific theme behind it so it could just be me lack of context on my part but as this pack stands I don't believe it be suitable for the goals of the project.
Speaking of types of packs: This is just me spit-balling ideas but I don't think you should focus to much on creating specific genre based packs like @Pengr suggested. Instead find shows from a bunch of different genres but are similar in tone or themes. This is just a rough example but like a Melodrama pack or something. Of course maybe having 1 pack that is genre specific and just changes what genre it focuses on every month or so is also a possible route you could take.
Well I think that is everything I had. Good luck with the project !