quality worsened

HI, new to printing.
I have had my ender ke for around a month and was very pleased with it.
However, the past few prints have started to look rough , with vertical portions, instead of being straight are crooked and irregular.
I have tried different materials, cleaned out the feed tube and fitted a new nozzle,also leveled the bed.
Printed the benchy boat on factory settings and that looks rough

Can you help please?