[caffeine]

Remote working has definitely exacerbated the problem. Your latest role probably sees you as experienced and therefore requiring less hand holding.

One good way to get up to speed that I've seen is to say "there is no good onboarding for newbies, I will make one." Then go through and document everything needed to get productive. It gives you ego armour to ask basic questions because you are documenting the process, and it will force you to be thorough in getting yourself up to speed.

It will also make you the defacto mentor for new people (whom you should task with updating the onboarding guide), which is a very powerful thing - if you mentor new people, you will be seen as a leader and eventually you will be a leader.