My thoughts:
1- Wild life NEEDS to be expanded further more, more types of fish, sharks, birds, adding whales, dolphins, bears, boars, tigers... There are a lot of animals that would fit the SoT islands and seas perfectly. And make a system where you can get a pet for free, maybe only once per character? Like taming a dog or a cat. Paying 5€ for a pet feels a bit scammy
2- More weapons is also something I would like to see, although it would take devs lot of time to balance, but as another idea, they could make a test server to (test xD) upcoming changes and ideas with testers and recieve the feedback they need. Actually a lot of games are adding this type of servers since it helps devs a lot.
3- Add more landmass, I mean SoT it's a game about ships and pirate adventures, but I would love to see some greater landmasses, maybe a central City port with lots of stores? Also bringing to the game more land "related" content, more thant just looking for treasures in the sand or killing some generic skeletons.
4- Make PVP fights more realistic, I hate having to fight against a non stopping jumping shooter yelling some insults in russian to me. Make bodies feel more realistic, heavier, and slower. Making jump just an addition to pvp and not the main strategy
5-Add more players per server and more players per ship, the ships feels like it they were designed for more people, 4 per galleon with 8 cannons? Really Rare? My perfect setup will be 3-4 in the smallest ship, 5-6 in the medium ship and 7-8 in the galleon. Also it would prevent players like me (with more than 3 friends with SoT) making the hard decision to decide with wich friends I will play tonight
6- Make real dungeons, caverns and puzzles, not just puzzles you can complete by looking at a piece of paper for 2 seconds. Also, more types of enemies and adventures, since the ones that we can play looks great but repetive.
I know that almost all I have said here will not be taken into account by the devs, Im just saying some changes I consider vitals to keep me and my friends playing in the next months, and probably more players thinks the same.