I agree you have to mix it up, but going all in with a flush draw is a beginner (fish) play. You usually want to put all your money when you have the better hand!
I'll call you every time with top pair in that situation, and people have drawn out on me but I got the money back with interest fairly soon

The best strategy has to be a mix. Raise some hand for deception, push with the better hand.
One thing is clear, you will not loose with solid poker over a reasonable amount of time. Might make less money, but will loose less money.