I haven't managed to find a working strategy yet.
I am looking for a mentor, who could show me a working trading strategy to become a successful trader.
My friend, sorry to tell you that, but in your own statement you have answered yourself why you didn't achieved what you want. As I like Hungary and Hungarian people I will try to put some light on it
If you think your goal as a trader is to find "working strategy", then you will never be (or maybe not never but the chances are very low) a successful trader.
It is not about strategy. In fact strategies are much less important then the skill of observation and adaptation, risk management, money management or psychology. You need to put tons of hard work and commitment to it. You just need to like to dig and dig and dig for informations, you need to like to test things, you need to like to improve. And you need to adapt to new market conditions. Strategies work and stop working over some time and you need to develop new ones (of course there are some concepts that last very very long but I try to make it easy)
You didn't provide here any specific info, what markets are you interested in ? (or it's just about "working strategy"... ?) What are your favorite instruments ? Do you want more to be trader or investor ? What kind of trading you think suits you the most ? your personality ? What have you tried so far ? and many other questions.
I'm sure there will be some helpy people willing to guide you in right direction, but you need to give some more info. You also need to be very careful on Internet forums. There is a lot of people who have advices for you but they in fact didn't make it themselves. And unfortunately their advices can more harm you than help you. So be careful.
And about people who are on the good way, they usually don't bother in replying to most of topics. If you want to encourage some of them to help you first show them that you already made some hard work, and that you are here not just for "fast easy solution". Maybe someone feel that wants to help you. You know why people in trading are not willing to share too much or just don't care to answer that kind of threads ? Because they know how much effort they putted in it and they know it is possible if you do so, so they expect you to put that effort yourself and to go through that not easy way. And they don't like someone who wants easy solutions. So don't be in that "basket".