Moving on to cheap and cheerful options from the Premium shop.
If you are willing to blow a little money on the game, you can currently get the Tachibana Lima and Smith for 89 (Euro) cents each. These are bad ships; they make you work hard for your wins. But even if you don't like that specific challenge, you can always sell them and are left with cheap port slots. Not as cheap as the discounted port slots for 120 or 150 gold but who knows when that will happen next. (Probably some time before Christmas, which is when there will also be other discounts, so have a quick glance at the news etc.)
Since you are grinding German BBs, Emden would fit in your port if you like that kind of ship and develop a nostalgic taste for the odd low tier bout of sealclubbing later on. German BBs of the higher tiers basically demand a secondaries/brawling captain build, and that little thing benefits from most of the captain skills involved. So even though on paper, Emden looks like a worse if fancy looking Dresden, she is a lot more fun with that high skill point German BB captain at the helm than your Dresden or Kolberg with a regular Three-pointer used to be. The basic game play remains identical to those ships, of course. Something similar might go for Albany but I don't have that ship myself. In any event, discounts come and go, and low tier ships are sometimes the most heavily discounted ones.
Marblehead Lima can currently be had at €8.99, it's basically an Omaha with better torps and would be a very worthwhile addition despite the horrible camo. Texas you should already have, free of charge, since you hopefully used an invite code to set up your account, also currently discounted, recently buffed with a spotter plane, but imho that was not enough to make her a good offer. Arizona is better but has worse AA than New Mexico, which in the current carrier surge is a very bad thing. Would not buy. And neither is there anything else currently on offer to grab my fancy. Watch out for good value premium account deals as the holidays draw nearer, and meanwhile have fun with other things like the RN Arc and the upcoming Halloween special.