I have had a brother and sister pairing of cats since they were 4 weeks old (same litter too). The male was definitely the bolder, always being the one to check out an area before my female came timidly behind. In my apartment, though, they almost never jumped around. They struggled to jump onto the counter and would often use the kitchen table to then get onto the counter. This was also true past when they turned a year old. Since moving back to my parents for personal reasons, my male cat has been climbing and jumping everything in sight that the other cats I have had in my 19 years have never even attempted to go to. While he has tried to jump onto these shelves and higher places, he has also in the process knocked over some very priceless things on my shelves. Also as another environmental note, there are 6 cats in total at my parents house now (2 of them are my cats) which they did struggle to get along with. My male often chased all the cats around to assert his dominance and would need to be frequently put back into my room for "time out".
I am not sure what I can do to prevent him from jumping on shelves I do not want him to be on. The shelves are jam-packed with items, too, but he jumps up regardless and will knock things over. The squirt bottle has little effect on my cats as well, and many forms of discipline I have tried do not seem to work with him in general.
I can't really move the shelves either or move things away from them so they can't reach, as I don't have the room or ability to provide enough spacing for that to happen. Someone suggested a kennel from them, but I am not a huge fan of using kennels, as I feel it is cruel to keep an animal locked up in such a small space.
EDIT: I am looking for a different solution besides using a water bottle. The duplicate in question has 2 answers, both with the main bulk revolving around using a water spray. As stated above, this doesn't affect my cats, and so the answers to this question are of no use to me.