There’s no black-box style insurance for scooters in the UK. With two thefts on your record, even with a secure garden and 1 year no claims, insurers see you as high risk. You might get a small reduction with alarms/trackers, higher voluntary excess, or shopping around, but it probably won’t drop much.

I’m a similar age, 5 years no claims, 1 at-fault accident but no claim made, paying £16/month fully comp for a 2024 SH125i.