Are you sure that AI or large scale systems actually exists in the markets you are looking for? Not all markets support the same industries and as you would probably know the number of times it's just lip service and held together in the back with cellotape is still amazingly high. To really get into this sorts of things you would probably be having to pursue a role labeled as architect if it wasn't a market where these things were relevant. The kind of job you are looking for probably isn't being posted in a place you can find it, and I have found that recruiters are the gatekeepers not any public posting. I haven't tried cold messaging recruiters of companies I am interested in on LinkedIn but I think that's probably what I would do, you could also cold message engineers working in something you find exceptionally interesting.
Try some of the alternative sites like hired.com where it just isn't blindly submitting resumes.
Are you just interviewing poorly? Is your resume even relevant? I remember reviewing someone's resume last year that still had Windows 98 as a skill. As just a general resume trend listing every version of a thing you know is less popular than listing the types of skills you have and if they want further details be ready to provide it.
From the salary side are you just capped out for the market? There are definitely some places where 150k is the ceiling that's very hard to break without some sort of exceptional relationship with you as an individual and the employer, or an industry that just happens to command higher salaries. If you want to get into say 250k town in a 150k market you've got to be doing something differently than just being a tech lead and trying to climb the ladder.
A couple weekends to get up to speed so you can talk to the interviewer at the same level will always do better than 'I can catch up' but in the conversation it is clear you are missing the big picture. Someone who is living and breathing the problem but just needs to switch gears to actually apply themselves to it will go to the top of the stack versus someone who is like 'teach me.' So many people show up to interviews and show only passing interest in the work to be done and the conversation. Don't be that person.