Endgame feedback

So, I have only just found my first citadel on a character with as of typing 11 Days 4 hours 53 minutes and 34 seconds. I died in this citadel to one of the two things that ever kills me. A mana siphon rare monster spawning out of nowhere on top of me. That citadel (which has 6 portals btw) is now gone forever. 2 weeks of mapping to find this and it is gone in literally 1 second because I play with Chaos Inoculation and Mind over matter (siphon speed needs to be lowered massively or set at a flat rate not %, it's feels very cheap to die like this). This game has a massive problem in the endgame and I do understand this is early access and i know it will improve eventually but to me endgame is in urgent need of help. First of all, it should not take me over a weeks worth of mapping to find 1 of the 3 citadels required to face the pinnacle boss. The spawn rate needs to be improved and there needs to be a way to be directed to where they are. Wherever that is through lost tower completions or simply quest markers, it is absolutely unacceptable to have such a core feature locked behind pure RNG of mapping. Secondly, why is it during the campaign you are allowed to die over and over and retry the area but in endgame one death wipes all of your progress and you lose everything, this isn't a huge deal for regular mapping but with rare events like the citadels and pinnacle activities it is utterly absurd. How are people supposed to learn the mechanics of these boss fights when it takes an absurd amount of time to even be able to attempt the activity and one death puts you back at square one. I have done 7 breachstones, 5 audience with the king only 1 of the expedition boss i forget his name (have only had 5 logbooks drop total btw) and 0 Simalcrums. I have also killed arbiter 3 times. with the exception of 3 breachstones and 2 audience with kings (which i found only after getting the notable passive in the ritual atlas tree) I have bought every single fragment with the currency i find whilst mapping. This does not feel rewarding to do at all. I'm not saying i should be able to do these pinnacle activities with just 1 or 2 hours of farming etc but the current state of accessibility for these activities is ridiculous. I have been thinking of starting an SSF character but I genuinely cannot see a way outside of just getting very lucky that i will be able to engage with the actual content outside of mindlessly mapping. I want to end on a positive note and point out that this is purely constructive feedback, I love playing the game if I didn't i wouldn't have 11 days of gametime on one character already. Really hoping to hear about some swift improvements to the endgame systems ASAP.