Here is my betting strategy:

High odds and many combinations

I always choose games with high odds from four different leagues – these are games where the odds are at least 2.50, no matter if for a home win, a draw or an away win.
These games I then bet mostly on 12 or 13 different seem with 1 or 2 euros each and of course different combinations.

You always pay about 20 euros stake, but always wins at least 40-50 euros because the total odds are very high. And the chance that one taps at least once 4 games correctly with 12 different combinations, is quite high.