How to make best use of GP for transitioning from early to mid game?

Hi,

This probably gets asked a lot, but I'm looking for advice how to make best use of my GP for transitioning into mid game and start doing some PvM/bossing. So far I have been working on quest cape and have ~15 quests left with most of my stats in the 60s. Combat-stat wise I am around ~70 melee and magic, 60 ranged, 52 prayer. My question is, how should I utilize my budget of 3-5 mil to help getting into early bossing? Currently I am rocking helm of neitzinot, amulet of glory, (fighter torso soon), dragon legs, boots and defender, barrows gloves and abyssal whip (DScim for STR training). For mage I have Ibans staff and occult necklace, for ranged nothing worth of mentioning, just some basic red dhide with magic shortbow and avas device.

For melee I was thinking finishing fighter torso grind, and buying (eventually) abyssal dagger to replace Dscim for STR training, berserker ring and amulet of fury. For mage and range I have no idea, every decent upgrade seems very pricey. I was also thinking of investing some GP in bones to push ~70-80 prayer and maybe upgrade my PoH with some portals. Are these good ideas to work on? Anything else I should get early or spend my GP on? I know about firecape being popular end of early game goal, but I dont have enough ranged level yet for it, nor can afford blowpipe anytime soon to make it easier.