I often hear these mistakes made by German speakers who are learning English.
They say: I thought on you.
The problem here is with the preposition. ‘On’ is not the correct word here.
Correction: I thought of you.
If the sentence is then extended to talk about what you were thinking of doing we need an _ing on the verb
E.g. I thought of calling you but then realised I didn’t have your new number.
E.g. I thought of inviting you to the presentation but there was not enough time.
E.g. He thought of applying for the job but it was too late. He’d missed the deadline.
Have fun learning English!
Louise