I'm not sure I'm quite answering your real question, but:
1. Look around at your job and people in nearby jobs/careers. What do you need to learn now for the next five years of your career? (What do the people five years more senior know that you don't, plus where is the whole industry moving?) Learn that. You make sure that you learn that - don't depend on on-the-job training or a job assignment. (If you get a chance to learn it on the company dime, of course, take it.)
2. Places are good places to work only until they're not. You don't have to stick out a terribly job for 50 years. If your BigCorp (or your startup) has an environment that you find soul-draining, wait a few months to see if it can improve. If not, leave. Don't wait forever for them to fix it for you. Go find something that fits you better. (There are companies that are somewhere between FAANG and startups.) Take a bit of time - you want to go somewhere that will be better for you than where you are, not just somewhere different.
1. Look around at your job and people in nearby jobs/careers. What do you need to learn now for the next five years of your career? (What do the people five years more senior know that you don't, plus where is the whole industry moving?) Learn that. You make sure that you learn that - don't depend on on-the-job training or a job assignment. (If you get a chance to learn it on the company dime, of course, take it.)
2. Places are good places to work only until they're not. You don't have to stick out a terribly job for 50 years. If your BigCorp (or your startup) has an environment that you find soul-draining, wait a few months to see if it can improve. If not, leave. Don't wait forever for them to fix it for you. Go find something that fits you better. (There are companies that are somewhere between FAANG and startups.) Take a bit of time - you want to go somewhere that will be better for you than where you are, not just somewhere different.