Start with rolled r
Do not ask for a full accent review. Start with rolled r inside one useful phrase, then repeat the corrected version before moving to b vs v.
Prompt to try
Run a short Spanish pronunciation drill for rolled r. Give me one phrase, listen to my attempt, and correct only that sound or rhythm issue.
Move from sound to answer
The pronunciation target should appear inside a normal answer about travel and service situations, not only in isolated word repetition.
Prompt to try
Put that same Spanish sound into a realistic answer and ask me one follow-up question.
Keep feedback usable
If the correction mentions rolled r, b vs v, pure vowels, ll/y sounds, narrow it back to one sound. Focused repetition is easier to remember during live speech.
Prompt to try
Give me the plain-language pronunciation correction, then make me repeat the whole sentence twice.