Trying to figure out and align James Bond continuity is like making a vodka martini from Siamese vodka… it can be done, but it’s not going to result in something that is very palatable or satisfying.
I remember one of the first attempts, a crazy theory promoted by many fans, one that aligned all the Bond films by saying “They are all different men, given the codename James Bond along with the number 007.” That theory was “blown up” (along with Bond’s childhood home) in Skyfall when we see the grave of Bond’s parents. Bond isn’t a code name, it’s his name. He’s just one (really cool, well-trained) guy.
You could also say, because of the last scene in Skyfall, that the other Bond films take place AFTER the movie ends… which makes no sense because of the fanboy-pleasing callbacks in the movie and the many topical and technology references in the earlier films.
There is no “Grand Unified Bond Theory” that makes it all make sense, as hard as we would like to try, because it Just. Doesn’t. Work.
Bond is an “evergreen” character, open to reinterpretation and “resurrection” every few years. It is what has kept the character alive and relevant, the same way different takes on the character of Batman/Bruce Wayne have occurred over the years. You can’t align the Bond movies into a single timeline anymore than you can make the Christian Bale Batman exist in the same “universe” as Adam West and Michael Keaton.
I love continuity as much as the next fanboy, but we should really take the sage advice of someone much wiser than I am, a man who long ago said “Just repeat to yourself ‘It’s just a show, I should really just relax…'”