Converting my aquarium to tropical - any tips?

I currently have a 200 L planted aquarium. I want to convert it to a tropical tank – maybe with angelfish or something interesting. I use to have a goldfish in it – so I am wondering if I need to completely gut the tank, or will it be alright to just do a massive water change and gravel vacuum – as well as heating it up, changing the filter media and giving it a few weeks to stabilize.

Will I need to do much more than that to make it suitable for tropical fish?