There's no need for any sort of "new process for long-term carbon sequestration". We just need to stop taking carbon that is in the process of being sequestered by natural cycles and putting it back into the atmosphere. This is an economic challenge not a technical one.
Recent work[1] has argued that microbal and fungal diversity did not play a significant role in the development of coal deposits, but rather it was a combination of environmental effects that generated swamps where anaerobic conditions prevented plant decay. These conditions still exist today, we are just actively removing them.
Either way you haven't made a case, or provided sources, for why it wouldn't work.
Some methods are apparently snake oil[1]. But others, such as pumping into saline aquifers[2] may be viable (the source on that is naturally suspicious).
1. https://grist.org/article/rule-four-of-offsets-no-enhanced-o...
2. https://www.spe.org/industry/carbon-capture-sequestration.ph...
No really, how? Have you invented some new process for long-term carbon sequestration from waste biomass?
These are hard problems that don't lend themselves well to the HN-preferred format of one-line tech solutionism. If it were as simple and easy as all that, we wouldn't be in this crisis to begin with.