Website , flyers and business cards

I have a basic website built on the 123 website builder platform and need to expand it to more pages and look more professional look and brighter but with the same sort of colour scheme. The pages will be basic and need to be edited by me at a later date. I have a IG and FB and the website www.bellablinds.co.uk. I also need flyers and business cards to match the design. I am in no rush to do the project as I am not even trading as a business yet. Advise on if I pay to upgrade website builder or move to wix or Wordpress. I am trying to keep the cost down