Can't access disks, visible in disk utility

[mithcio]

I tried to search the forum but can't find this topic.
Sorry for the photos instead of screenshots!

So I have MacOS Catalina installed on Dell XPS 7590. I can't migrate my system using time machine and migration assistant, it gets stuck at the beginning (on preparing the data or searching for incompatible programs), even though I succeeded once in the past (I reainstalled the system many times on my XPS before getting everything right). I'd like to keep trying but...I run out of space. I have 3 partitions (macOS, macOS - Data and untilted (visible as blank in disk utility on my photos), which is a windows partition. As you can see - the space is taken, I can't access it in anyway though. Can't find the way to delete these data, free up space etc. Can't see the macOS disks in finder.
Any ideas on how to solve it without formatting it and reinstalling the system?
Also - has anybody encountered the same problem with time machine? Getting stuck for some hours and quitting unexpectedly, while occupying space on the hard drive?

If you need more information about my Dell, some screenshots from diskutil in terminal or anything else - please let me know.

 

[mithcio]

EDIT - I managed to access the disk MACOS. MACOS - data is still unavailable and this is the one which is almost full
Can't go through time machine part though ;(

 

[Feartech]

EDIT - I managed to access the disk MACOS. MACOS - data is still unavailable and this is the one which is almost full
Can't go through time machine part though ;(

going by your hardware profile.... oh wait....

As per rules, please update your hardware profile to allow others to help you easier

https://www.tonymacx86.com/account/account-details

please read the faq for proper hardware profile setup:

[FAQ] READ FIRST! Laptop Frequent Questions

Before asking a question, many common questions are already commonly asked and answered, and many answers exist in the sticky threads in this forum. Read this post before and any relevant guide before asking a question... If you ask a question that is answered by this FAQ, you'll likely be...

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[mithcio]

Sorry sir, and it's done, note sure about the motherboard though....

 

[Feartech]

Sorry sir, and it's done, note sure about the motherboard though....

as the faq mentions, you pop in your laptop make and model like i have done:

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