1) Instaforex is a bad broker. Has a big spread and multiple scam accusation on Forexpeacearmy.com
2) Plus500 is just for gamble. I don't like them (but have traded oil with good spread and high leverage). They have a bad reputation on Forexpeacearmy.com too
3) E-Toro is a shit Broker. High spread and not transparent policy.... They have a bad reputation on Forexpeacearmy.com too
4) I suggest the follow broker: Admiralmarket, 1Broker (read tread in service ), Activtrades, Exness , Hotforex, OctaFX and Oanda.
5) I suggest to trade olway on account with low spread, fast withdrawal option available and leverage max 200x. Never against Market and fix Stop loss.
6) Loss could always happen. Keep calm !
*If you would know how if possible to earn more, PM me
But forexpeacearmy is not a sacred word in forex. I have traded for more than three years at instaforex with no problem, and you don't seem an old trader as you say.