you don't exactly need an art style to do commissions!, if you ever feel like doing them just show some examples and ask the person who's commissioning which one they prefer:)
basically do whatever you want and don't take in consideration what people may think, you have one life so why waste it thinking about what others think
i guess in this generation everyone is acting more mature, if you look back to the 2000's 11 year olds were way more childish then how the majority act now mostly because of the influence of social media but in my opinion there isnt anything wrong with being childish, i myself am 12 yet still enjoy things other people my age could consider childish