System Update (Can I skip updates)

I have not updated the system for a long time and now there are already 10 updates pending. I have version 0.21 and the latest is 1.7, can I install only the latest update? I have a OnePlus 7 Pro, 0.21, root, and decrypted (because of twrp).

Yes. /e/OS updates are complete, not incremental. Newer versions of the updater seem to even have this built-in as a helping hint (at least I’ve seen it).

Be prepared for some changes, taking such a large update step.
Especially this … Advanced Privacy - know all about it.