I don't think there's a way to interfere positively with DLM
Oh, I see. I just remember turning off the router for more than 15 minutes and then turning it back on can help. But, thanks for letting me know. I'll know now for future.
The 30 minute thing is a way to make sure that your negative impact (turning off the modem) isn't interpreted too negatively by DLM.
There is NO way to positively affect DLM.
All you can do is leave it alone, and wait patiently. And even then, you don't know that negative things aren't happening anyway.
Note that DLM really determines your line to be in one of 3 states each day: bad enough that intervention should scale up; good enough that intervention can be scaled back; in between, where the level gets neither better nor worse.
Real deintervention requires a number of consecutive "good" days. However, multiple interventions within a few days are likely to increase the number of consecutive days needed to clear again. And the odd duff day in between might be enough to start the counter again.
Plusnet have a page. I don't know that it will help.
https://community.plus.net/library/browsing/fttc-dlm-what-it-is-how-it-works/You might have started to figure why no one fancies playing with DLM much.