Small Transport
Air Traffic Control Fully Certified
Air Traffic Control Time Certified In Pos 1 (yrs) 16
Workload; Situational Awareness; Other / Unknown; Distraction
ATC Issue All Types; Conflict Airborne Conflict; Deviation / Discrepancy - Procedural Published Material / Policy
Air Traffic Control Issued New Clearance; Air Traffic Control Separated Traffic
Airspace Structure; Environment - Non Weather Related; Human Factors; Procedure
Aircraft X was inbound to ZZZ from the ZZZ1 airspace. I verbally coordinated a 360 heading with the north controller because I was vectoring off the arrival for sequencing. I took a handoff on Aircraft Z at 10;000 feet direct ZZZ2; at the same time I had two ZZZZZ departures that I was worried about being a factor. I was vectoring Aircraft A off of the arrival as well as Aircraft B. I was trying to make sure there was enough room for Aircraft A because he was a heavy and [I had to] get Aircraft B behind them. I wanted to group the 3 small transports together and get them to final before the next set of arrivals. I turned Aircraft X. I then turned my attention back to the final and didn't notice Aircraft Y; who was controlled by the north controller at 4;000 feet inbound to ZZZ3. As soon as I noticed there was going to be a loss of separation i turned Aircraft X northeast and climbed them. It is very hard to get used to the traffic after Covid. This was the first day I had to take every aircraft off the arrival in years. I was so concentrated on my feed to final that it caused me to lose track of other aircraft away from the airport. I think there should have been stricter Traffic Management Unit (TMU) numbers in because both of my sessions I was vectoring over 20 miles off the arrival. If the sector was not combined that would have helped too.
TRACON Controller reported they issued a 360 degree vector for sequencing to an aircraft and failed to notice that it put the aircraft into confliction with traffic at the adjacent sector. The Controller noted a lack of proficiency at working busy periods due to the recent reduced air traffic due to COVID-19.