AC Gas, check and resolve if required.
Condenser service as DayRider mentioned above.
Add auxiliary electric fan on condenser that turns on with the ac but from a electrician that understands how much pull/push is required. The fan does make a difference on old AC units and is an easy an economical add on which works.
For better flow in the cabin, get the blower motor and fan both inspected and if required replaced with an upgraded unit. Also a good and economical add on for old SUVs.