Looking to put savings to better use

Hey so current situation is wife and I have $10k in a goalsaver account with a further ~$5k across 3 youthsaver accounts for our kids. We've been putting $400 a month into the savings and looking at increasing that amount come the new year.

Looking at the interest we get on the savings I can't help but feel we could be doing something smarter with the money. I've been kinda looking into commsec and been watching some youtube videos on investing (admittedly super basic stuff but gotta start somewhere).