If you want to add some look to your writing, immerse yourself fully in the secrets of handlettering. Look for available calligraphy courses in your area, or get inspired by online video tutorials.
For a start, familiarize yourself with the individual fonts and try out several types of alphabet. Gradually go through all the tools, from the pencils through fineliners and markers with special tips up to brushes with paints.
KOH-I-NOOR HARDTMUTH TIP: For bright-coloured writing, use the set of fineliners that deliver a distinct thin line even after a single stroke; they are also suitable for hatching and small/area colouring.