Midway with the paint care

Hello together, I have read something here in the forum and also read through the advisors etc.. Unfortunately it does not help me so much, because usually the optimal way is described. But I am looking for something in between. So far I drive with my vehicle into the textile wash and mostly do the full program (super foam, paint protection and care (except for floor wash). Yes, is not the best, I know. Now comes my new vehicle (leasing). It is a 4 BMW with the Indivi dual painting San Marion Blau. I would like to take care of this paint more consciously, even if it is a leasing. I don’t have the time to take care of the car care every week. Speak of pure hand wash including polishing etc. My question is therefore how to get the best out with a reasonable wall. We have boxes for manual laundry next to the textile wash. Should I wash the car here completely, or a combination of both? Own sponge, if yes, you have a Recommendation? Should a hand wash in such a box be significantly better and the time was spent in the frame, that would be OK. Should I also pay attention to something at the beginning? So if the car is completely new? Many greetings n3