eBay search matches buyer queries against your title and item specifics. Words that are not in the title are much harder to be found by, so every one of the 80 characters should be something a buyer might type.
A keyword order that works
Brand
Model or product line
Item type
Key specs: size, colour, material, capacity
Condition or notable detail (e.g. 'New with tags', 'Boxed')
Before and after
Before: L@@K!! Amazing Nike shoes great condition WOW
After: Nike Air Max 90 Mens Trainers UK 9 White Grey Leather Running Shoes Boxed
What to cut
Filler like 'L@@K', 'WOW', 'Amazing', 'Rare' (unless genuinely rare)
Punctuation and repeated words
Words that describe your shop rather than the item
Do not forget item specifics
Item specifics (brand, size, colour, etc.) power eBay's filters. Fill them in even if the same words are already in the title.
Skip the typing: upload a photo and get a ready-to-paste listing.