Tom Holland might conclude his run as Peter Parker after starring in four more Marvel films. However, neither Marvel, Sony, nor Holland himself has confirmed this claim, nor have they announced a timeline for his departure from the role.
The social media account Culture Cave claimed, citing Variety, that these four projects include two standalone Spider-Man films and two crossover films featuring multiple characters from the Marvel Cinematic Universe. Currently, this specific number of films cannot be regarded as a confirmed plan.
Holland previously discussed the character handover on the Happy Sad Confused podcast. He stated that since the conclusion of Spider-Man: No Way Home, the team has been considering how to pass the mantle to a potential successor; he has a fairly clear idea of how the transition should happen, but the details may still change in the future.
Holland has also expressed a desire to bring Miles Morales into the live-action film universe, stating he would be willing to help the young actor who takes on the role in the future. However, these statements only indicate that he has considered the generational transition of the character; they do not prove that the "exit after four films" plan has been approved, nor do they confirm that Miles will necessarily be the successor.