i have written a pretty extended answer for that topic but i will rewrite it in case people missed it.
back in the day it was pay to play you had more than 1 account and the progress was so slow, you would need at least 3 to 4 accounts which is $60 a month, a lot of hours and the right supports and classes to be able to play, even if you were a support, you would still need a spoiler maybe a crafter or a town alt etc...
Even with the slow progress, people that never stopped playing, would keep up with updates and now are at the top 5-10% of players.
I am not here to justify ncsoft, at this point I am not sure there is turning back ( i wrote content for approx 24 videos, that I will not make at all due to how the game is atm)
but what I can tell you is this, if you add 50$ in the game per month, and buy the right items with the right class, you will be able to play, it will take time but you will be able to play, the sad part is that the game has moved on, there are so many updates that people have missed that those that return no longer know how the game works and the way the game is right now.
I cannot suggest a number to do it, cuz I know that not everyone can afford it, but will say that you could "invest" a good amount upfront to gear a character and play... consider that money "lost progress" or something, just trying to give a point of view here not force people to do it.
People remember the good old days and think that getting to 110 is easy, or you can progress with just exalted or blessed exalted set which is not the case for 99% of the DD's (or the enchanters).
The worst part of all is the people that still play, have no problem paying for something but the absurd rates make it worse than a casino. Personally I am at a point where i do not open boxes at all, i rather buy the ncoin, sell boxes and get the adena. False advertising ( or items missing from the drop table), low rates, crappy events are what lead people into quit, demoralise and lose interest, the reply from @GM_EVA is something I have not seen for a while.
I am not sure if he/she can do anything to improve the situation but I guarantee you that players are starting to lose patience, and im not talking about the f2p players who mostly pump up the server numbers but the ones that pay a substantial amount every month both for prestige/destiny on multiple accounts but for loot boxes too.
Most people get the slower progress, the more you improve your character BUT what has been going on with GRS in unprecedented, they could have instroduced a new item to make it more rare or 1% craft, but not being able to learn the 110/115 "good skills" is plain stupid...