Hi,
Mayb you can work on ur left hand first; try different ways of playing (arppegiate) a chord;
say for a given C chord, can play
1) C G C (basic)
2) C G C E
3) C G C D E
4) C G D E C
you can also choose the notes u want to repeat, like instead of 1) C G C E can play C G C E C E C G by repeating C E n then comin down
if r past this stage, prob can do things like :
1) add chord tones/notes (e.g either C, G,E when the chord is Cmaj) to melody on right hand to make the melody sound thicker
2) Use a mix of different accompaniment patterns; like hold some chords, run some, play at different registers
There's actually alot you can do actually; explore ! hope this helps
Regards,
KJ