Going to give a brutally honest review: I would not recommend playing these games.
Despite the fact that it was crafted with love, and significant progress has been made from game to game, there's one glaring issue that just makes the games a painful chore. It genuinely kills any satisfaction the endings bring, and it hurts to say when there's so much potential.
TLDR; The characters are unlikable/unreedemable. They come off as immature, whiny, bitchy, and self-important (constantly lashing out at characters who have done nothing but help them) without any charm or redeeming qualities. You don't want to see them succeed anymore or even care if they get a happy ending. (Even if these games center around children, it doesn't cover for them being completely unlikable. There's a way of writing bad traits but still making a character enjoyable.)
The best example I could give is Reca.
She values her feelings over context and the pain Zero goes through. In the later game, she lashes out at Zero for saying that he essentially hates them and their mission, despite knowing full well that he was stuck with an evil energy that could alter his mind (she even tells him to fight it at points). Instead of blaming the literal monster energy that "infects minds and twists emotions", she takes it out on Zero, to the point where she had planned to leave the mission all together. This comes off as beyond self-important, and makes the character extremely unlikable. Even Zero protested that he had no control over it. It made me want to see her leave the party, even if it meant a bigger challenge.
Throughout these games it's been characters who lash out at their innocent friends, characters who are vain and belittling without redeeming qualities, characters who are constantly complaining, etc. When you only like one character in the whole entire game (Yuusha), there's a problem. But, in this newest game, there are more characters that are redeemable, enjoyable, and relatable; it's just become a giant hit or miss for each one.
If I had to make any suggestion, take some time to work on character writing, specifically how to make a character likable or endearing despite the flaws you give them. You've improved so much, but there is still a massive weak point that needs your attention. And I know if you take the time to work on it, you can make something amazing.