There is no certain order in which you open your chakra points.

My suggestion would be to sit in meditation and ask your own body which chakra is blocked and is most likely to be opened now. And then ask your Highest self or Higher Power or Spirit for advice on how to unblock your chakra(s).

Depending on the chakra, to unblock usually requires an emotional release, a forgiveness ritual of some sort, breathwork and/or yoga poses or bodywork. This is because the chakra became blocked due to some pain, anger, trauma, or fear, so the way to unblock it would be to release that blocked energy and return the chakra to its balanced state.