Hello there i summed my portion of suggestions about the game, so i hope its ok, its not set by some priority just random numbers.
1: Combat make properly visible how many balls u hit and make some graphic announcements about citicaly hits and so on
2: Combat make clear wiev from the side of ship, let ppl shoot without aiming the guns by right click, just for fun.
3: Make ships more loosable during different events like missions especialy pve events its gonna improve the economy, ppl are gonna craft more because ppl are gonna looking for more ships, more craft = more items trading ect.
4: PPL Love collecting things make some nice main port interface where they can collect various ships and can really see the docking in ports next each other, via world of tanks/world of warhips
5: let ppl collect more ships in ports let them buy more slots for money or ingame currency - copy succesfull system like wargaming has trust me they know how to make money and use simple and cleaver microtransactions to fund your game because - u dont wanna live only with 40euro from few thausands ppl from buying the game do you? U even cant. without monthy payment.
6: if its not something super tactic lower the wind affection in open world map
7: Dont use only open sea combat areas, if ppl dont want something on days on sea is another sea, be variable make combat maps near little islands and forts to make it interresting.
8: Force ppl to buy ships from nationality they choose (if u collect enough ships of course) BUT let them collect other ships aswell via other nationality factions in different locations, do not let player get anything u really dont want for free, let them earn it, my suggestion is to make diferrent little faction for example france factions separated from france but with their own french ships and let ppl do missions for them to collect prestige and chance to buy other nationality ships, trust me this is gonna everybody love.
9 Make ships buy and rewards in port interface so interesting that people actualy feels its something unique, if u put just a felthy name of the ship in some stupid bar nobody gonna cares but if u do some nice ship tree where ppl can actualy see the ship and can visibly dream about it its much higher chance they are gonna buy it and put it in their collection
There is a lot i would love to say or see in the game but dont forget guys collect or borrow ideas from other similar games and maybe try to improve them, especialy money ideas, i dont want to see you bankrupt sorry for english and wish u the best luck with game.