Small Transport; Low Wing; 2 Turbojet Eng
Air Traffic Control Fully Certified
Air Traffic Control Time Certified In Pos 1 (yrs) 1.5
Situational Awareness
ATC Issue All Types; Conflict Airborne Conflict; Deviation / Discrepancy - Procedural Published Material / Policy
Air Traffic Control Issued New Clearance
Staffing; Human Factors; Environment - Non Weather Related
I was working all positions combined in RADAR. Traffic started to pick up far more than what we have had over the past few months due to COVID. Aircraft Y was level at 10k westbound and Aircraft X was east; inbound ZZZ out of 11 for 2500. I saw the traffic and turned Aircraft X 15 degrees left to maintain separation from Aircraft Y. I thought the turn would have been enough for 3 miles and degrees of divergence but ended up not being so. At the closest point I had 2.87 laterally and 800 ft. We went from a slow COVID season to busier than normal with a lot of crossing traffic.
TRACON Controller reported a loss of separation.