Trading strategy just makes your trade become easier. Still it's not guaranteed you always get the profit from trading, sometimes you will just lose the money.

If you are not fine with that, just make your own job(entrepreneur) and pay someone to do the job for you.

It doesn't matter how good your math is, trading is not something that generate you fixed income. Sometimes you could get nothing from there or even losses. I'd rather stay at my primary job and do trading for a secondary income. At least if I had losses, I could have just recover it with my other job.