I'm afraid the era of slow, talented players ended a while ago. In modern football, a lack of pace and dynamism is often a significant drawback. While Miretti doesn't exactly mirror him in characteristics, he does remind me of the Brazilian Ganso in some respects. Ganso was an extraordinary talent whose career was hindered partly due to his lack of pace.
However, there are aspects of Miretti's game that can and will improve. Compared to last year, he is thinking and reacting much faster. He got used to the pace in the top flight. He is likely to continue improving in the future, further enhancing his strengths. Yet, his lack of pace will be a critical hindrance and it's leading me to predict that his career will not reflect his talent.