Sell ​​funds with high custody and fund costs and convert them into ETFs?

Hello everyone, a few years ago my mother inherited a six-figure sum and invested it in the local Volksbank - yes, I know. Unfortunately, since I wasn't old enough to understand all the dimensions at the time, I wasn't able to intervene in time. Now I took a closer look at your depot and was a little shocked at the costs. The depot costs around 1.3% of the depot value per year, which is the biggest exclamation mark for me, which is why I at least take a short break