Might need to refresh your memory a bit. Last season you did 10 transfers, of which 5 were purchases and 4 were sales, and one was bought back (I can't remember how it's usually treated for such players, but iirc the transfer money % rolls back to day 1 right?). Season 43 you had 6 transactions, 4 were purchases and 2 were sales. The only season where you came close to your "one trade per half season" was season 42, where you had 3. Even in season 41 you had 8 trades. That said, I'm not sure how long does it take for that part of the fan survey to recover, so it still could be irrelevant, but your transfer activities seem to suggest it can (unless maybe if you went all 2 balls for season 42)
My previous team hardly did trades, even if I did it was mostly supporting players coz I had my own home bred franchise player, and I never dropped below 4 stars iirc, tho the part where the fans think the manager is doing everything he can to improve the team section is always at two balls. Even with this team, which I only made my first ever trade recently due to the salary cap being imposed on me, I have always been at 4 balls and above (until I did the trades and it dropped).