Dinahmo is right. You have to learn about your asthma and what triggers attacks and remember everyone’s asthma is different. I use the high dose Relvar Elliptor steroid inhaler. It is taken once a day in the morning. I take Ventolin most days too. I’m triggered by cleaning products, air fresheners (never use them) pollution coming from cars and vehicles, especially diesel, smoking (other people’s obviously) dust, building dust, some paints, hair spray - especially L’Oreal, and occasionally by drinking a glass of red wine, but this is rare, and I still have the very occasional glass without a problem. Chest infections, colds and viruses cause my asthma to worsen and often I need a course of steroids if I have any infection. Covid made me seriously ill and I was hospitalised. I forgot to say I also take a tablet each day. It’s called Montelukast and someone else upthread mentioned it too.
I think you need to try the treatments you’re offered but go back to the asthma nurse if you don’t think there’s any improvement. There are lots of treatments and it may take time to find the best one for you.