buy supplies for 70 fletching, and supplies for 10k yew longs (preferably yew logs + flax, so you'll get 150k crafting, thats how i got from 35 to 77 crafting lol and you make 60-70gp per bow profit more than with bs)
that will have costed around 4m.
then if you complete them you'll be around 80+ fletching and you'll have 5-5.5M that you'll be able to spend on Herblore or RuneCrafting.
Herblore if youre 38 i suggest this:
buy like 5k vials 150-250ea.
buy around 100 ranarrs 7k each
get 100 snape grass by yourself
make 100 p pots and sell 7-7.5k each in world 18 edge.
re-buy ranarrs etc. until you have no more vials.
you'll be high herblore lvl and you'll have pratically lost no money.
then you can spend the rest on RCing and make some profit off it when youre 44
have fun training