If you cannot think of ideas for composition, do not begin by forcing yourself to write full sentences. First separate idea generation from language production. Ask what could happen, why it might happen, what choice a character could make, what consequence follows, and which concrete details would make the situation believable.
A useful composition usually does not need dozens of ideas; it needs a few connected ones that can be developed. Build a small bank of situations, motives, conflicts, turning points, and consequences, then practise expanding one simple idea into a sequence before worrying about sophisticated vocabulary. Strong writing grows from organised thought first.
Use the English Learning Hub for composition and writing routes. If vocabulary is limiting what you can express, continue through the Vocabulary Learning Hub.