I've won close ~3b boxing now.
Only trick that makes a massive difference is - PID.
Can't be asked to explain what it is, but I'm sure you can find threads about it somewhere.
Also an example/simulation of what would happen to me.
Box 10m Lose
Box 20m Lose
Box 10m Win
Box 10m Win
Box 30m Lose
Box 30m Lose
Box 20m Lose
Box 200m+ Win
I'm superstitious when it comes to staking.
When I feel it's the right time, I stake BIG.
Whenever I'm low on my cash pile I tend to stake my bigger items.
Then win. Making loads amount of profit.
Good luck, try watching some vids on boxing. Always make sure you look at the options and make sure you're not getting scammed.
Always have runes / SoL / Claws / Arrows / Bow / Shield / Summoning pouch & Scrolls / Pots
Just in case you do get scammed, you at least have a chance.