Make a cat tree more appealing by checking its position, access and usable features before adding toys or treats. A cat may ignore a tower because the bed is cramped, the structure moves, the route is awkward or the location feels exposed. Start at the base and work upwards, checking that each level offers a comfortable step and a clear return route. Place it near an area the cat already chooses, provided the surrounding space is suitable.
Familiar bedding may help if it fits safely and does not obstruct movement. Invite voluntary exploration with calm nearby play, and allow the cat to stop. Avoid repeatedly lifting it onto a perch, as that can bypass the very access difficulty you need to notice. Give the arrangement time to become familiar. If the cat formerly used similar furniture but now avoids climbing altogether, investigate that change with your vet rather than relying only on encouragement.
Change one thing at a time. If you move the tree, replace its bedding and introduce a new toy together, it becomes harder to tell whether the successful change was the location, scent or activity around the lower level.
For product comparisons alongside this advice, see Ultimate PawHouse and Taj-MeowHall. The details below explain their sizes and uses.
Further reading: cats.org.uk; rspca.org.uk; cats.org.uk.
Ultimate PawHouse
Taj-MeowHall
Cat-Cave