Based on quick researching, bison and bitcoin.de are the popular ones in your country. I'm not familiar with both of them so, you got to know more about it through your local community.
I just found examples of leverage over 20 even in Solana and Ripple.
That's quite high already.
Start it low. Maybe don't go over 3x to 5x and it's best for you to start in the spot rather than leverage.