Even if you go through a load of photos and delete ones you don’t want to keep - you will only have to do it again every few months ( to stay under 15 gb etc )
The easiest thing for you to do is just buy extra storage from Google ( Google One is the app )
I did last month - it’s only 70b a month for 100gb
that’s absolutely BS - cars need to be registered to be driven legally
Sure you can insure it - and sit looking at it parked outside your house - but you can’t legally Drive the damm thing on the roads if it’s not registered