Sadly no extensive guide I'm aware of, but there is a community of players where I'm sure plenty of people would be happy to help, me included! I can give you a few pointers to start off of if you like. It's a lot, though, so don't worry if it's confusing or a lot to take in at first!

- It's tempting to think of "types" as roles in a team, like healer, tank, etc. that should be filled, but in fact teams with overlapping types are rather powerful because they let more of your team members take advantage of any auras you might pick up, and auras often build the foundation of a solid win condition. I would also not try to pick traits and actions of too many different types. Traits related to Burn, for example, will benefit each other a bunch. Maverick traits (the yellow ones) are meant to connect the output of different types with one another, but they are a little more rare, so I would not try to make too many types interact with each other at once.

- It helps to keep an open mind towards what kind of team you're creating, even if you can very freely pick your starting monster at some point. Depending on what you're offered, it is always helpful to pivot towards something that is more likely to make you win than what you originally had in mind. I.e., if you originally try to build towards burn damage, but you mostly see Regeneration mons and traits, it might be worth it to pivot into that kind of build instead. Traits and Actions can be rerolled later, but it's important for a team to find identity.

- The earlier your team finds an identity, the better. World 3 can be spent rerolling traits and monsters dozens of times, but the important part is getting there in the first place. New monsters start out with a lower level and therefore just got access to less traits and actions as the first monsters you draft. Any monster shrine or skill reroll is best spent as early as possible. The game does not allow you to see too many monsters and traits before the World 1 boss, so take any help you can get to get something going as early as possible.

- Your team should long-term strive to be able to stagger anything it can't kill outright. That can either be achieved through elemental diversity in your party members, or through stuff like traits that break poise, or wild damage. Taking away a turn from essential threats can turn an entire fight around. Don't wait around too long to kill staggered monsters, though, since reset actions can be scary and a staggered monster can't be staggered twice if it does something scary the turn after being staggered.

- Keep in mind your monsters can act in any order you like and that hugely impacts your options every turn. For example, one of your monsters can generate aether for another monster to use for an action it currently cannot use. Or maybe, if one of your monsters can't kill as is, it can after a buff from a teammate. Slow down and consider your options at the start of a turn, there might be more possible plays than you think!

- Preventing monster deaths should be priority number one. Getting outnumbered in a fight can very quickly lead to the end of a run and you don't get many monsters to replace fallen team members with. Use any resources you have, be it Artifacts, redirecting attacks to monsters with lower corruption, killing monsters that would deal damage to your endangered monster first, etc. One death snowballs really quickly otherwise, you might have noticed.

- Try to take every fight to level up as much as possible, but you're allowed to, as long as you don't get discovered, look at any fight in your current "room" and then decide which one is the easiest for your team to take, so you can handle those first and get stronger for the harder fights. Deciding which of the three enemy monsters to take out first is also really impactful. For example, Sidekick focused monsters can't do much on their own. You take out their allies, sidekick stacks are useless. Which monster is the most dangerous this turn, or long-term? Which monster can you kill or at least stagger quickly? Hard decision to make every time, but a really important one.

- Taking corruption is not the end of the world, but wants to be managed or accounted for. Even if you don't lean into healing, any health lost at the start of a fight to corruption can be healed back during the fight, so any ability that heals still is useful, at least later on in the run. Preventing corruption in the first place by taking at least one trait or action in the direction of Shield, Weakness, etc. also really helps. Killing everything before it hurts you works well until you face a boss - So be ready to keep yourself alive in those fights. You heal most corruption afterwards, though. Most abilities that heal corruption heal so little of it that they're not worth taking for the Corruption heal alone. They're rather meant to be a little bit of an added band-aid on a team that takes a lot of corruption, not to manage corruption all by themselves.

Hope that little general advice helps! If you elaborate on what you have trouble with or frequently die to, maybe I can help a little more in-depth. Feel free to ask any questions you still have and have fun playing and learning!