Fernando Alonso has offered some cautionary advice to former world champion Sebastian Vettel regarding the potential challenges of returning to the sport.  Vettel, who retired at the end of the previous season, has not ruled out the possibility of a comeback, but Alonso, who himself made a successful return to the grid, has highlighted the hurdles involved. Vettel, a four-time Formula 1 world champion, announced his retirement at the age of 36, citing his desire to dedicate more time to his passions outside of F1, including his environmental endeavours and spending quality time with his family.  However, he has left the door slightly ajar for a potential return, stating, 'I can't...
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