So here are some improvements that I feel could be made to the game, it feels like everything is in limbo and nothing is happening. Hoping this will create more of a constructive conversation and give some ideas from a "hardcore" players perspective.
Communication: Start a weekly/bi-weekly post with an update on what you are working on, or thoughts on the game and it's progress. That little bit of communication could go a long way with players and help to prevent it from feeling like it is dying.
Event rewards: The rewards are very weak for anyone who is not in a top guild. For the equipment, do something like guaranteed gold for the top 3 guilds, blue through gold quality for 4 to 10, and green through gold for the rest of the guilds.
Secret Shop and energy: Keep the current energy deals, first 5 in a day gives 10 gems for 60 energy then add a 20% chance that all future shops throughout the day will have an extra 10 for 60 or a 10% chance that there will be a 20 for 80-100 deal. You can play with the appearance percentages and energy amounts but keep it at a good value. This will encourage players to maintain an active friend list and keep themselves active within the game knowing that they could get a good deal from the secret shops for energy.
The secret shop equipment chests: Remove all the more common farm-able equipment types, and leave the unfarm-able chests with sets like poise. Either lower the cost of the chests to 800 gems and leave the contents as they are, or leave the price at 1200 gems and guarantee that they will contain all gold equipment. The reason I think this change would work is that even though you get gold gear, the sub stats on that gear is random and could still be complete trash. You would still be able to benefit from the matching stats enough to make it a worthwhile purchase and so that you don't end up with extremely expensive blue junk. With the game in it's current state it is pretty much impossible to attain gold gear with sets like poise without paying for it.
Rare equipment sets: Consider giving us a way to farm for sets like poise if you don't want to change the equipment box sale chests within the secret shop. Even if you do make secret shop changes to the chests to allow for all gold, it will still be tempting for the p2p players to skip some of the grind and operate as more of a pay for convenience rather than straight up pay to win that we currently have regarding some of the best sets like poise.
Tower Difficulty: Give us a more challenging tower. Currently you can beat the entire thing with well under 200k power as long as you have the hero skill coverage needed for the specific fights. Make a hard tower that isn't easy even with the right hero skill coverage and that requires some of the strictest gear requirements to complete in the game.
Tower Rewards: As they are, they are very weak. You get a few 3-5 star summons(Weak), very few gems(Weak), one skill imp(That is perfect imo), and 10 legendary shards(Weak). Buff the rewards for the gems, maybe 150 total summonite shards, and give a full legendary summon(Nat5 summon rates on those are low enough to be fine). Better rewards would give more excitement towards finishing the tower. Transcendance has been teased and sounds like you will be able to fuse dupe nat 5's into each other so a slightly increased shot at summoning them through a little more legendary summons wouldn't hurt by the time that comes around.
Events: Give more of a variety of events. Look at your competition for ideas. Even some of the more simple ones where you collect rewards for activity based points can be enjoyable and rewarding.
Promote your game more. Get popular youtubers from similar gacha games to play and stream AFTER fixes have been made.
There could always be some more newer content idea but we can save that for a future post, as this is more for quality of life. These changes could satisfy your more casual and hardcore players at the same time. I'm here for the long haul as long as you all keep working to do your part and make this a successful game, it has a lot of potential and I really enjoy it for the most part.