nice job on your race! even though not sub 5 I agree with Not An Expert that you very well were in 4:55 shape and still nice PR
glad you're excited to run some 1500m races and you can definitely focus on laps 2 and 3 now. good luck on the 5k by the way I bet you can go sub 17 (unless you're really not good at longer distances which I doubt you seem fit enough)