Hello.
I would like to start off by saying that this update as far as im conserned is the most impactful and my favourite update in the game so far. I would really like to keep on playing it months and even years down the road and I have couple of suggestions that I think would keep the playerbase inside of that system healthy.
I think that main 2 factors for that are que times and the reward system.
Im going to start off with the reward system. Even when the current rewards are some of the most well designed cosmetics in the game I am conserned that once people reach that goal they might just yeet. Level 1000 curses are something that only a select few will go after.
To combat this I would like to suggest adding 2 additional lines to the season pass each season. One for reapers side and one for athenas side that would allow you to progress both of the factions each season and earn additional faction based cosmetics.
I think that would accomplish 2 things. First of all it would ease the grind for the curses as there are now side goals. Secondly it would make people repeat that content each season.
Now to address some ideas with the que times.
After certain time period under water (i.e 5minutes) place 2 invading ships that are under water against eachother in a server where there are 2 open spots.
Secondly allowing defenders to vote on the table when they are ready to be invaded sooner so they wouldn't have to wait out the 20 minute global cooldown.