Now, your account doesn't fit most of OSRS gold these requirements. I recommend these stats: The two 80 strength and attack. Defence is okay for today... 70 Prayer+Piety. 80 magic (this is why you will lose hp - you pray melee the whole time. Hope that helps. How to battle them? Pot up, pray melee and piety, attack and observe your health.
They was like 400gp every now they are like 220 gp each. Why are firelighters tradeable now? As soon as I got mine from a clue scroll they weren't... Firelighters became tradable using all the recent upgrade to clue scrolls before this month. Lobsters have dropped in cost because a few weeks before, a new NPC was inserted to Musa Point that will swap your lobsters, tuna, and swordfish for noticed variations, allowing free players to fish them more quickly.
This not only improved the supply, but also made it a lot easier and more desirable for bots to fish there, so a lot of cheating-inclined players started macroing there and added added to the glut of supply. Each of the players who had their kingdoms place to fish dropped millions of swordfish and tuna onto the GE at once, causing the price to drop. Lobsters have a tendency to follow along with the purchase price of swordfish and fell so as well, and the price is still recovering.
Not one of your methods are making much more than 200k gp/hr, so no more, you are not being effective. I suggest you develop your character by doing quests. You've got far too few quest points and all the best moneymakers, gear, and training methods are unavailable to you because of this. Questing unlocks new activities and new equipment while being the most effective way possible to level up your abilities (quest xp rewards! ) ) . So. . .do some quests.
Anyhow. Yew logs are only terrible and cheap RS gold just make about 80k gp/hr, which means you should give up those completely. They are bad for cash at all. I don't know where you have the idea they were, tbh. Magics are equally as poor and maximum out around 150k gp/hr even at 99 woodcutting under optimal conditions.