I know that this isn't the anime section, but I felt like taking the liberty of sharing a possible team for Ash in the event that he does remain as the Main Character in Gen IX, and if the next series does end up being a traditional one. Truth be told, I mostly don't want this to be the case as I like Journeys change in the formula, but nonetheless, I'm just doing this for fun.
I'm posting it here mainly because I don't want to bring up spoilers in the other sections, but please just ignore it if this is uninteresting to you; and feel free to remove this post if I am violating any rules.
That being said, here are my personal picks:
Pikachu (Electric)
Cyclizar (Dragon/Normal) - Would obtain at the start of the series.
Sprigatito > Sprigatito2 > Sprigatito3 (Grass/Dark)
Dolphin > Dolphin2 (Water)
Paldean Wooper > Paldean Wooperevo (Ground/Poison)
Primeape > Primeapeevo (Fighting/Ghost) - Would evolve from the one he had in the OS.
Also to add on, in the event that the next series does end up following the Journeys formula, here is what I would like his team to look like:
Pikachu (Electric)
Cyclizar (Dragon/Normal) - Would obtain at the start of the series.
Tyranitar (Rock/Dark) - Would be the same Larvitar that he befriended in Johto, now fully evolved.
Paldean Wooper > Paldean Wooperevo (Ground/Poison)
Gardevoir (Psychic/Fairy) - I know that it's kind of a weird one, but I felt like a popular feminine Pokémon could also suit his new team.
Primeape > Primeapeevo (Fighting/Ghost) - Would evolve from the same one he had in the OS.
Realistically, he would probably also obtain DLC Pokémon further down the line, but nevertheless, feel free to tell me what you think and share your own picks as well.