When you say dropping each review session, how much? Like from 80% to 30%? Because if they stay above 75%, maybe even 60% or 50%, I wouldn’t worry too much about it. Yeah, it’s sad to see a low accuracy percentage, but I see that as the SRS working - it catches the things I don’t know well and cycles them back in. Honestly, I don’t worry too much about mine (they tend to be in the 70%-90% range depending on the number of items reviewed, which works for me)
If you’d still like to get a better percentage, there’s always this self-study script, but be careful not to mess up the SRS with it. I would recommend using it after reviews, not before.
I hope you find a good rhythm with your reviews! Best of luck!