I think the difficulty in improving his attacking play is he wasn't actually that young when we bought him. It is probably a lot easier to polish a 17 or 18 year old that has good ability but lacks defensively than attempt to improve Wan-Bissaka. It's quite rare to see drastic improvement in basic technique such as control, dribbling, passing well into somebody's 20s. Probably not impossible but the margin for growth is not so big, I don't think we can expect miracles on that front. Which probably should have been picked up during scouting, maybe it was and we reasoned we can get away with the particular balance AWB offers although with our current right wing options that isn't working out.
It's generally decision making, consistency, tactical awareness and things that come with maturity and experience that have greater scope for improvement. In that respect it will probably be a case of tidying him up so we see his best performances more often rather than thinking he's going to become a good attacking right back.