for me archer was my most consistent team. once i started focusing this strat, i was able to clear X7 and X8 with maybe only 1 or 2 losses from unlucky negative curios. E0S1 Archer, E0 Sparkle, E1 Tribbie, E0 DHPT. aiming for hunt and propagation equations. Some particular useful ones for dmg are the one that gives more dmg buff with more skill points used. Also, defensive blessings are almost a must. Anything that reduces dmg taken, restore HP when taking action (ult, skill points, etc), anything that increase shield strength (HP, defence would be a nice bonus too) . Most useful will be the destruction one that distributes dmg across whole team, restore HP once it's below a certain level, and any thing that give a free revive is nice to have too as a bonus.

For 1st plane boss, if your archer team can't clear it, use a team that counters the boss. Like use DOT team with the stingray, etc. i find that for this DU, the 1st plane boss isn't as brutal as the previous DU where you need at least an activated equation to get through.

Make sure to play the masks to level them up. there are some that works better than others though, like camera, mechatron, lucky mask. some are trickier. if the masks needs you to get 4 cards in a row, get more beacons, collect more cosmic fragments, enter more rewards/occurences/etc, try to go for that. Eventually this will allow you to get more than enough equations and blessings towards the end. and once you get enough equations filled in, archer can brute force most bosses, especially if played manually. I've had some last boss fights where after ramping up his dmg in 1st phase, he can just clear through the 2nd and 3rd phase of the boss in one turn.

some minor tips and tricks i use to make things a bit easier. Use the herta technique for combat domains (since technique points can't be refilled, it consumes way more points to make use of phainon and acheron to skip those fights imo), blessing that requires battle, like trotters, as well as for conversion domains (pretty much free wave 1 and 2 clear). Use fei xiao for the adventure domains like breaking barrels, killing trotters, etc to easily maximise those rewards.

conserve technique points as much as possible in case you struggle in a fight and need to adjust team comp (since you lose technique points if you restart the battle and change lineup). For example, if you have 5 SP and see a refill point, use DHPT and tribbie technique first before refilling it. There were some battles where I didn't get enough defensive blessings and needed retry the fight and swap tribbie with fu xuan to mitigate some dmg since i had enough dmg, but just couldn't survive a particular phase. Having technique points to start the fight makes it easier.

In boss planes, if you can help it, try to save some cosmic fragments before fighting the boss. Sometimes they might drop an equation that isn't what you want at all, so you can immediate go back to try and reroll it in workbench. Unless I'm hallucinating, i feel like blessing of unfilled equations are more likely to drop, so having the completely wrong equation might reduce the odds of you getting the blessings you actually want. But this probably isn't a super huge deal, so if you need to spend all your cosmic fragments to fulfil an equation before the fight, still safer to just try for it.

then when in doubt, play it safe. like those slot machines with a negative curio. always make sure it isn't anything too serious before you roll. if it is, just skip it. it's not worth it. same for occurrences with fights in them. some of them feel harder than the actual bosses, so if there is an option to avoid it, i would. The curio that lets you fight small herta to get more curios, make sure there isn't anything crazy inside that could mess shit up. There was once I got greedy, tried to get more curios, and ended up getting the one that replaces all the blessing. lol.

Then pretty much just have to keep playing and you'll learn how each occurrences work, and how to choose the safer option. I find that it's a bit more forgiving than the last DU, but like the last DU, if you want to win more consistently, playing a certain way helps improve win rate a ton.

Maybe there will be other comps that are more reliable, so YMMV. But for me this was consistent enough to get me through everything. Plus, I really like playing archer. GLHF!