How to merge/delete edges?

I have this object that I got by doing multiple Boolean with other shapes and I ended up having multiple “sections” - edges - in my final object. How can I have a clean object with only the basic corner edges?

Step 1: Select all, press M, choose By Distance to remove duplicates
Step 2: Select edges you don’t need, press X, choose Dissolve Edges

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Not possible, if you have holes in a face you get this undesired edges, cause a hole needs to be connected to the surrounding geometry.
You have to reroute this edges or make cuts where you want them and deslove them.

This worked for most of my edges - thank you for that!

But there are some that I cannot delete without affecting my object’s structure. How can I deal with this issue?