Since the black spirit [Daily/Weekly] Boss Summon Scroll quests are all gone, 

https://www.naeu.playblackdesert.com/en-US/News/Detail?groupContentNo=6759&countryType=en-US#Contents

The eight boss gear title became almost impossible to obtain.

Filled With Red Nose's Energy , Title Requirement: Obtain Red Nose's Armor

Braids Look Good On Me , Title Requirement: Obtain Giath's Helmet

Owner of Unbreakable Gloves , Title Requirement: Obtain Bheg's Gloves

Holder of Steel Shoes , Title Requirement: Obtain Muskan Shoes

Blessed by Calpheon , Title Requirement: Obtain Dim Tree Spirit's Armor

Dark Lord , Title Requirement: Obtain Griffon's Helmet

Steel Claw , Title Requirement: Obtain Urugon's Shoes

Dragon's Choice , Title Requirement: Obtain Leebur's Gloves

Please add the new method to get the title, like when using Latent Boss Aura to exchange the boss gear, we can get the relatively title.

It is should be possible to easy fix because I recently talked to an NPC who once offered a quest for the Dandelion Box and I received an overdue title.
So it should work the same for these titles: anyone who exchanged 100 aura for an boss item should get title when talking to the npc.

Would also like to add that I obtain title for muskan shoes after 4 years .... from event box. And I haven't obtain title for getting dim armor until today, despite the fact that I got dim armor from the loot, but from a field boss, and that doesn't count towards the title!

And one more thing while we are talking about titles: still some titles for killing 1 and 10 of some bosses in the main quest do not work. 

So please fix this as well, and additionally give us opportunity to interact with spawning places of these bosses and ability to summon them after completing main quest, because although I have 30 characters on my account, I have completed main quest with all of them, so I can no longer complete  main quest again without deleting characters three times.

Also the knowledge related to these scrolls bosses is going to be much harder to get, especially if you want high grades. I would like another way to farm these titles and knowledge now that the scrolls are gone please!

How about no, you snooze you lose.