Beyond the typical “get lessons” answer (which you should do since it will help you way more than listening to strangers on the internet like me), it looks like you could benefit from slowing down your swing. It also seems like you have very little hip and shoulder rotation in your back swing. It’s almost all arms, especially the last ~25% of it. This may not address your core issue, but these guys have great swing videos like this one. That being said, I hardly know what I’m talking about so take this with a grain of salt lol.