When does it make sense to switch to Teilkasko?

Had a debt and an uninsolved accident. In the case of the former 700 Euro deductible was to be paid, although I am insured with the mother. I was free of harm for over 2 years, but the level never went down. 140€ premium per month is also an announcement. Should I make a partial cascade? Then the monthly premium, the deductible probably does not decrease. Probably something like hail s Is and was not a leasing vehicle. Ask for information. Lg