Hair woes

Is anyone else having an ongoing battle with their hair? First off my hairstyle is pretty nuts, I'd gotten a lovely bob with undercut (to help with hot flashes & just general heat) just before the 2020 lockdown and got my partner to maintain the undercut with his clippers while all the hairdressers were closed. Later that summer crazed from being too hot I had him help me shave all the back & sides off right up to a mop of hair in the middle at the crown. Now I chopped & changed a few times since but have pretty consistently reverted back to this hairstyle and am back rocking it now. However, the lengthy hair doesn't seem to grow properly anymore, it's all bitty & uneven and really frizzy (I did do an ill advised bleaching last year which it can't seem to recover from). When the humidity is right I can get it to dry naturally in a way that sits nice & not annoyingly, but now that it's autumnal I need to blowdry & it's just an ugly lump on top of my head that I can't do anything with. The shaved hair grows back fast & with virility but the lengthy hair is just in bits. How do I have 2 kinds of hair on my head now? I'm too scared to shave it all off because I'm not exactly a big fan of how I look these days. It's bad enough this nightmare peri rollercoaster that I'm on without constantly looking clinically insane.