Bookkeeping versus accounting assignmet

I'm a chartered accountant trying to build a small accountancy practice.

I have this opportunity to work as a bookkeeper one day per week.

I can work only 3 days per week only. And these 3 days only 3/4 of the time. 

Should I use the day of finding new clients and growing my practice and learning new accountancy skills or should I accept the assignment as a bookkeeper?

Many thanks