Thank you for your responses to my questions.
I will try to type better when on computer but there is no betfair in my country. Unfortunately
Same here, but you can use white label exchanges via an agent. They have the same markets/odds/liquidity as Betfair, just no API to use trading software. Challengers is a bit hard to bet on Betfair due to low volume, but as I saw you also make some bets on ATP level from time to time, that would maybe bring you some benefits.
Not sure i trust 1xbet but they have everything
1xbet is not to be trusted. You can bet there and try to take advantage of their good and early odds. But make regular withdrawals and be prepared to not get paid at some point.