Which mountain after Galdhøpiggen?

Good afternoon from England, ladies and gents of r/mountaineering 👋

My friend and I have decided to hike to the summit of Galdhøpiggen this year, and we are minded to take the route crossing the Styggbrean Glacier, so that we can get used to walking on glacier (with crampons) and walking in a line on a fixed rope. Previous mountain summits reached include Ben Nevis in Scotland and Inspiration Point in California's Stanislaus National Forest.

My long-term goal and ambition is to one day summit Mont Blanc. But I know that for that aspiration to be fulfilled, I will need to learn more professional mountaineering skills (like how to self-arrest with an ice axe, which I haven't been taught how to do yet). Mont Blanc is probably a couple or so years down the line, and after Galdhøpiggen I would like to graduate to a higher altitude mountain and one that is a step up from the hiking / climbing difficulty of Scandinavia's highest point, but one not as difficult or requiring as much skill or preparation as Mont Blanc.... one that bridges the gap between these two, so to speak (well, at least one; I'd probably like to do at least a couple of other mountains in between Galdhøpiggen and Mont Blanc).

Which is a good mountain to think about moving on to after Galdhøpiggen but before being ready for Mont Blanc? I'm thinking this could be either Allalinhorn or Gran Paradiso (or both)? I'd be interested in what people think with regards to these two or if anyone has any other suggestions.

Thanks in advance :)