I have been doing the same work routine for basically 30 years. Only once and for about a year and a half I did something out of my career field. It worked for the purpose I needed it for but I returned back to what I was more familiar and comfortable doing. So I can see why you want to get back to what you did previously, you had a system which was fulfilling and rewarding to yourself. Wishing you to find whatever checks all the blocks :-)
!LUV
!HUG