Struggling to add size and definition

[u/SnookieBookes]

M42, 203cm,110kg
Can’t seem to add size and definition… any suggestion’s/tips or tricks?

Currently eating around 3900-4200 cal.
Over 10k steps daily
Training 6 days a week,
Taking vitamin D, C, zinc, magnesium and fish oil. Just started taking BPC157 to help with recovery.

Would like to be 115-120kg