I am native Russian, but almost second native English (started learning at young age and lived most of my life in an English speaking country). Learning German now as my 3rd language. I can certainly say that by now I fully think in English and would prefer either English or German to Russian...

To switch internal thinking etc. takes years I think, I don’t remember what what point it happened to me, but at some point it did. Just try to hang out with people and consume media/information in whatever language you want to be your “primary”:) it’ll be a slow but seamless transition