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Get an external drive (USB-HDD or -SSD) on which to backup everything.
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Get a large enough USB stick and copy the ISOs you want. (Alternatively you can also use a USB HDD/SSD.)
Ventoy is a very good tool to use for such a purpose that resolves any trouble multibooting of many ISO-files easily. Be sure to include Gparted-LiveISO and Clonezilla-LiveISO on your USB-stick or -drive.
From there, you’re free to go any direction you want!
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Boot Clonezilla live on your (Ventoyed) USB to backup your old partitions to the new external USB drive, HD or SSD, the one to contain all your backups.
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Then use Gparted live, again from USB to layout your partitions on the old (internal) drive.
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Do clean installs on to the newly created partitions on your old internal drive… all from your Ventroy stick or drive.
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Restore your needed files from the backups to the newly installed system(s).
P.S. - If you decide for a thumb drive, storage and read/write speeds matter.
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