I have flight tickets for November. Should I postpone?

Hello!
I think I should have researched a bit more when I bought the plane tickets. I got them from the 30th October to the 19th November.
My plan is to spend the first week in Bangkok, Chiang Mai/Rai and then spend the other two in the Islands.

I thought in November it would be already fine but I’ve been reading that it’s still raining often/cloudy. I have discarded going to Samui, Tao and phanganh because I read it’s very wet then. So I was planning to visit Lipe, Lanta, Railay and Phi Phi that should have better weather.

Do you think I will get sunny days to enjoy the beach? Or should I postpone the travel? (I can do one ticket change) Would it make big difference if I do it at the beginning of December?

Side question: what do you think about my choice regarding the islands? I want to enjoy a bit of both worlds: relaxing beautiful beaches and resorts, but also some parties from time to time (I am 28 yo).

Thank you all for your help :)

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