Maybe just freshen the site up for a start before you decide what to do with it. I work for a web agency and when I looked at the site the first thing I noticed was the animated advertisments - which would instantly put me off considering to go with you as a web agency. No offence, but if a potential client thinks you're paying for your site through advertisments then they would assume that your not the biggest company and this would cast doubts on your integrity and your financial backing behind the company.
If you're receiving money through those adverts could you not switch to cheaper hosting and lose them? Also I'd take a look at the design in general and see what you could change - I noticed a lot of centred text which has always been a no-go for me.
Let us know what you end up doing