Hi mermaid
Well it's really up to you. Colon Cleansing can bring many benefits, one being a clearer complexion. There are also many ways to cleanse your colon. You can always go with some sort of
Hydrotherapy, but this is pretty invasive. Not for the faint of heart.
A more simple way to cleanse your colon would be by using a colon cleansing product, such as oxypowder
Oxypowder is different than the 'herbal/fibre blend' you mentioned you tried, it's an oxygen-based colon cleanser. So it doesn't rely on fibre to bulkup and pushout any impacted waste inside your colon. It literally melts it. I've used this product many times and I would recommend it.
But it all depends on you. Do alot of research on oxygen colon cleansers. and the answer will come to you.
Best of health!