My videos are randomly flopping

On tiktok i have around 2150 followers and i got around 300-1000 veiws on average every video, now i am randomly flopping. yesterday i got a few thousand veiws in total with all the videos i posted but today i only got 3 and 10 veiws. Does anyone know how to fux this or why it's happening? I ddi post more today but i deleted most videos because they flopped. Im not sure if this has an effect but my sister took my phone last moght and changed my username and display name.