I've been a long time player and thoroughly enjoyed playing FF11 but due to the drop in the population of my server and not being able to find the help to do a bunch of things i had stopped playing. Personally I don't want to see the game shut down but its hitting the point that its become a shadow of its former self and less and less people are playing it.
I've met a bunch of people while playing FF14 that had heard about FF11 but had never played it and have expressed and interest in playing it, but have been told by various people that used to play FF11 that there was no point for them to buy it and play it just because alot of the servers are dying out so they would have alot of trouble finding any help to do the content with.
Some of my suggestions to try and revive the game are as follows:
1) Shut down the game for a bit like they did with FF14 and improve aspects of it then re-release it as a FF11 Reborn
2) Put in a duty finder to do be able to do things like missions, delve, dynamis and ect. Just that way the duty finder can build the party and pull players from other servers and saves the frustration of not being able to find the help to do those kinds of things with the lower populated servers.
3) Do either a one time free world transfer for every SE account for those that are interested in moving from a dead server to a more active one, or just remove the fee for the world transfers. There is alot of people like me that refuse to pay for a world transfer just to move from a dead server and would rather just quit playing completely.
4) From some of what I've read from other posts theres the not so liked server merge option
5) Make it so you can do any and all of the content with just a full party of trust npc's if that hasn't been done yet ( I know you can summon up to 5 trust now but I don't know if you can do all of the content for the game using them alone)
If anyone else has any other suggestions please make them those are just the ones I can currently think of right now. Other than that if no improvements are going to made in regards to the dwindling population and being actually able to do the game content when there is little to no help from other players available that i feel FF11 should just get laid to rest and shut down.