Can anyone help me please?

[Bony42]

Level 8 Magician on Blue Velious server. I have studiously sold all my loot as it happened and was able to buy new spells at L4 where an average spell cost 4 Gold but when I reached L8 I was shocked to discover that a single spell costs over 4 Plat. As I need at least seven spells this totals around 30 Plat and I only have 3 Plat in my bank.
I don’t mind grinding but can anyone suggest what I should do to progress from here especially as I am now faced with using the old less powerful spells on higher level mobs?
Any advice gratefully received.