Graduated c25k (timed) programme today. What next?

Although I don't use the NHS podcasts, I do use the RunDouble app which is pretty much the same programme. Because I originally started running in my lunch hour I went with the timed programme (working up to 30 mins of continuous running); now I mostly run in the evenings.

The question is where to go from here. I currently run to a playlist of songs around the 150bpm mark. I was thinking about maybe doing three runs a week: 1 day at a faster pace (my 155-160bpm list), going back four weeks or so on the timed programme; 1 day 30 min run; and 1 day set distance run (I can currently run about 2.5 miles in 30 mins, so probably aim for 2.75 miles in the first instance). Do this for two or three weeks then increase the time of the first run and distance of the third run. Or should I just move over to the distance programme and build up to the full 3.1 miles that way?

To be honest, I'm just thrilled to be in a position to ask this question as I wasn't sure I'd ever get to this point! All thoughts gratefully received.