1- Why ppl suggest
La'cryma Stick for sorc?
With pororoca shoes Lacryma gives you access to very powerful waterball. Bonus points for using perverse demon mask with enough str to bypass most of the boss' MDEF. Undisputed best boss killer unless his property is water
2- Kahii lvl up still effective?
Of course, why not. But after 140 you'll probably level in bio4 parties instead
3- Wich is the best gears to start solo?
IDK
4- I saw many discussions about Psych wave and DD spam , wich is the best to invest?
If by invest you mean optimize gear then the best one is probably Varetyr spear thanks to the fact that it ignores MDEF and with true celia cards deals very nice damage
5- Its whort o invest on gears that improve Earth grave??
We've got survival set and arc elder garment card. However, I personally consider it too restricting and I'm not sure if devs have already fixed all the annoying bugs with the set to begin with
6- Its worth to invest on Elvira to improve Aesir? 7- Magician Glove or king river?
Aesir? King river? I have no recollection of those. I assume you talk about varetyr spear and spirit king ring - according to sorc veterans on forum, cards that increase wind elemental damage do not affect magical portion of varetyr spear, so elvira would be a waste. Varetyr cares not for MDEF, so magician's glove is not very useful for it. Spirit king x2 halves the cooldown on varetyr, so unless we are introduced equips that double it's damage, SKR is going to remain best in slot.
8- How is to solo as sorcerer nowadays?
As long as you have access to kaahi it's easymode but stuff like bio5, I dont think sorcerer can solo it.
9- Can u guys, find a way to solo farm and collect all loots without weight problem?
What loots are you going to collect exactly? These days most of value is in cards, varous kinds of tokens (seagod, energy crystals, etc) and time-gated endgame equips from instances
