Did you expect over 80% accurate predictions for free from these sites? That doesn't make any sense op. Paid and popular tipsters are the only way to acquire >50% win chances through sites like OLBG etc based on what I have observed over time.
If you are serious about earning money in the long term, popular tipsters are your best bet. Free tips from prediction sites will only help to a certain extent.
Paid tipsters have higher chance of winning rather than free prediction sites.
You can't expect more from those free tipsters.
However, if the OP is into soccer, I assume you are very familiar with the individuals/teams involved.
Because if you know very well those teams, your knowledge alone can help you in the betting strategy.
Those tipsters will just be your additional guide in betting. In sports betting, the more you are familiar with the sports, the better chance of winning.