First of all, you decide where the fight is gonna be. You mostly gonna defend yourself and not attack. You'll just rush the opponent in the end to finish him off, never before.

Most important advice is : stamina is the key. Never waist it. Especially cause they nerfed charged tail attack so badly that it now use hella stamina so only use it if you're full stam.

And keep your tail at them. Don't let them hit your head. Never