I think that may be the issue, real SIM cards are way better i'm starting to notice.
By the way, did you made $0.00 ??? i find it a disaster man. I did $15 on my first try on cpa (spent about $30). I don't know what you promoted or how you did it but if it helps, when i tried it and had 0 conversions was because my landing pages sucked (you will never convert with those garbage default pages OGADs have) or i was slacking off not setting up my accounts. Yes i got many PV but most of my accs survived quite a lot even if i PV them with just 1 SIM card. I was also a cheap ass and used .tk domains which obiously contributed to the banning haha.
I'm giving it a shot again but this time with non.incentive offers following adnans advice, it is a cool guide, you should check it. Probably you are not learning enough bro. I'm amazed at how many things i learned just this week thanks to those guides. Like literally i didn't know that you had to ask the admins of the network to promote non.incentive offers (and i didn't really understand what a non-incentive was until yesterday lol). So it may be ignorance on your part too.
Anyways, if you are making 300 a month that is really cool! you should double down on that until you master it and then try something else to bring more cash.