I have the following tips for you if you wish to attend the Formula 1 Singapore Grand Prix in person having attended previous editions in person.
1. Members of the public and attendees are strongly advised to take the MRT to get to and from the F1 event area. Using road transport such as driving, taxis, private hire vehicles and buses is strongly discouraged due to the inevitable congestion from road closures. The same advice about members of the public and attendees being strongly encouraged to take the MRT to and from the event area instead of road transport also applies to events where crowds will likely gather such as F1, NDP, NDP Rehearsals, New Year Eve Countdown, CNY Eve Countdown and Chingay.
2. Do expect long queues in the open for security procedures.
3. It is going to be very noisy so it is important to bring along and use ear protection.
Other than the 3 tips above, I had a great time attending the Formula 1 Singapore Grand Prix in person.