We could always make more war in the Middle East (and Europe) and then 1,5°C would be totally viable. /s

Seriously now: Attempts to cut fossil fuel supply are worthless unless done en masse and in big scale - any single country doing it will just spur investment in another country. Since the world will not come to a truly binding agreement, the only thing that can be truly regulated is demand which can be regulated locally without necessarily increasing demand elsewhere.

The big new ticket is data centers, which strongly tend to use fossils due to SLAs and regulations. This can be fixed by new regulations, but only if people act now before the new approvals and builds are done.