Suggestions.

Make a new Duty Finder options, even if it's temporary, "MSQ Duty" -queues you for the current solo instance you are up to in the MSQ- or have the NPC comment when you proceed that the server is facing heavy traffic atm and you need to reserve a spot for the instance.

Since the solo instances are lacking that, a lot of data is being wasted just sending information to see if a spot is open only to be denied entry because it isn't. You could reduce the stress of the servers in that manner if people could just reserve a spot at least, since it is a bit misguided to suggest players should wait until someone gets out because. . . how will we know when someone is out? Without an indiication all people can do is wait a minute try, spam a few seconds, wait, try again. I do hope they are working on a means to remedy the situation so that the server can take more stress, time will tell though.

Another though I had was turning these instances into solo FATEs. Much like how there are solo instances which we can enter like an inn or The Rising Stones, you just create a diorama of where the fight is going to take place. Send off player to that solo instance, have the story take place there with the Cutscene taking place that then moves into the fight. My logic is that this could be another way of doing solo instances that doesn't rely on having to create a seperate area for it but rather work it like Squadron barracks, inn and the Rising Stone.