People who have been lifting regularly + taking creat*ne - What's the normal level of creatinine in blood test?

I am kinda panicking rn, my blood test shows I have 1.63 creatinine and eGFR is 57.42. I am extremely fit( 5km hills under 30km, bodyweight bench for reps , 15 pull-ups and 100 kg RDL) with BF% around 15-20 so GPT says this is normal for me but general physician says I need to increase fibre intake and reduce protein intake . I show no symptoms whatsoever and take 3gm creatine and 100-150 gm protein daily

Booked an appointment with Nephrologist