I would prefer that we not bring any new senshi into a new series tbh, at least not for the first new season/arc! It's been so long, I feel like it would be better to start slow and I've always wanted a season/arc that focuses almost entirely on what happens from the end of Stars and all the way up to NQS taking the Cosmos form (which isn't confirmed but that's my theory lol), I feel like new senshi would take time away from the current cast and especially since it's been such a long time, I'd like something that focuses on the existing, main senshi (and a villain) perhaps with the asteroid senshi.
I left a reply in an old thread, years ago, that is kinda relevant here for the 90's anime (remove and switch some things for a manga arc, replace episode/season with volume/chapter etc) to what I'd like to see if they expanded the manga and anime:
Well personally, I've always been really interested in expanding upon what happens after Stars, but I think with the Classic format, we would need like...four or five seasons to cover all of that considering the amount of time that passes before Usagi becomes NQS. What happens between the end of Stars and her ascension to the throne? What about the unspecified disaster that causes the Earth to freeze over and prompts her to take the throne?
I think it would be really cool if we had something like a combination of Crystal/Classic's formula- less filler than Classic, more filler than Crystal, and at the start of each season, we get a flashback from the Stars finale that shows more and more of the ''Light of Hope'', eventually showing Sailor Cosmos in full detail (with some detail changes, for example Queen Serenity has blonde hair in the anime so I think Cosmos should as well, and maybe round odangos since I personally think she's Usagi's form after NQS), and-like in Stars- these are all visions from Hotaru, and then she wakes up (then cut to the opening theme).
Or we could completely nix the Light of Hope idea because it's supposed to be Galaxia's starseed (though there's definitely a way to connect it to Usagi- perhaps it manifested itself as Cosmos to bring Usagi some kind of ''the power is inside of yourself'' moment or something) and still have the Hotaru visions, or maybe even NQS is the one experiencing them in the future instead, and they keep occurring up until the Chaos Battle and she actually gains her Cosmos form.
They could split episodes between the future and present time, showing Chibiusa's progression as a Sailor Senshi and perhaps even the reincarnation/awakening of the Asteroid Senshi, as well as small hints at a coming threat (which would eventually Prompt NQS' transformation into Cosmos, and like with her Super/ Eternal forms, she needs the help of the other Senshi or an artifact similar in function to the Holy Grail to temporarily acquire this form before permanently retaining it along with her Queen ''civilian form'), maybe some interaction between the royal family and Elysion. All while this is happening we're also exploring whatever causes the ice age (perhaps a new villain or some kind of issue with the Galaxy Cauldron) in present time, until the present catches up to the future and we get a final season exploring Cosmos and Chaos in the caught-up Future timeline. So basically the sequel seasons would bring the Anime to a similar place as the manga, then expand beyond it. The episodes could alternate between present and future (or maybe every third episode being future), which would leave viewers with a lot of suspense.