Advice for lifeless hair!

Hi all. I have fine and thin hair. I am getting married this year and still deciding what to do with my hair (in general). Some pics added of my hair shorter. Second pic is fresh blunt bob, feels nice and thick the first few hours after washing but ends up limp and rubbish after that. Gets greasy after the first day, I’ve tried not washing but I just think it needs it. I’ve had balayage to try and help with this and give my hair texture but just don’t think the colouring has ever truly suited my skin tone. Natural it is 2C but I struggle to keep it curly as any product weighs it down, I’ve only just gotten it to not completely repel conditioner! When it’s short, it doesn’t hold a curl so I’m stuck with lifeless hair. Pic to show what it’s like with braids (non existent!). Any helpful advice, please? Thanks!