If you want better compatibility with Microsoft Office files, you could use WPS Office. It has given me better results overall than OnlyOffice and far better than LibreOffice.
Not dissing the other suites, I like LibreOffice for daily use but there’s nothing I can do about M$ Office templates bugging out because they don’t follow their own OOXML implementation properly.
Kdenlive is acceptable for small video editing but I suppose you mean something up to the standard of Davinci Resolve or close