I've been on these forums on and off since 2018. In 2018 I was often bedridden and housebound with symptoms to include severe pain and chronic fatigue and had a myriad of other disabling symptoms too, and now I'm not bedridden and am functioning pretty normally by comparison, but I still have some pain.
For some people recovery is a slow and gradual process. Personally, I think it's that, unfortunately for me (and I more than surmise for some other people too), my lizard brain is over zealous at perceiving danger and extra specially 'good' at creating symptoms to protect me from the dangers it perceives. It used to see danger in everything (and accordingly it gave me a huge amount of pain and other symptoms to hobble me so that I couldn't even get out of bed to go to the bathroom) but now, by my doing mind/body work, it has calmed down and sees danger in fewer things and so my symptoms ('alarms') are fewer and far less severe.
Sure, there are stories of people who read a Sarno book and bam they're sorted and pain free for life without doing anything else other than reading that book and realising that their symptoms are mind/body, but for most TMSers recovery/keeping symptoms at bay means changing the way you live your life and your attitude towards every day stressors, and so on. Accordingly, usually one can't expect to do some journaling and be sorted for the rest of one's life. (For some people it might be the case, but I wager it's not the case for many.) Dr David Hanscom (who was a back surgeon) is another practitioner who recommends a form of journaling that he calls 'expressive writing' and he has changed the way he lives his life to include doing 'expressive writing' every day and incorporated other techniques to become and remain symptom free of his own back pain.
JournalSpeak worked for you... so, as
@Cactusflower advises, if I were you I would return to it and keep doing it... make journaling every day a part of your lifestyle. You might find that you only need to do it every other day or just once a week or whatever... or you might find you need to add doing some other mind/body techniques as well to your daily regimen to become pain free again and to keep that way.