If not, try to think 'outside the box'- what's something totally different that other people aren't doing? I'm willing to bet a lot of people will be dancing, singing, or playing an instrument. Are you good at being funny? Why not try performing a funny monologue? It's not hard to do and definitely something entertaining that people will remember. You could also try reading a poem or story (funny or serious, whichever you prefer.) Do impersonations or lip synch to a song, juggle or do some kind of sport skill.
If you need more ideas, try asking friends or family members what they think you're good at- they might have some ideas, too.
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