I would not say much because they will be ignored.
But give ignite a way to contribute toward the burst. The most ignite an opponent has the most damage some or all spells deal based on some percentage of ignite.
Increase pyroblast damage a lot and I mean a lot
Buff by good amount fireball and flamestrike.
Rework fully or at most combustion.
So either it has stacks that non guarantee critical spell’s consume to increase their own damage by good amount and guarantee critical so the pyroblast and flamestrike spam kept in check.
Or make it a dod that Also makes everyone who has it take a lot increased damage by your fire spell’s and guarantee criticals , that can be spread by fireblast, so it’s not that you purely have to disrupt fire mage plays during combustion but also player s under combustion can get away or open defensives to negate most of fire Mage damage towards them.
Change hyperthermia into decreasing casting time of flamestrike and pyroblast by 60-70% increasing their damage by 20% and give them guarantee critical instead of instant casts.
Pyroblast must give nightmares and spread Terror not tickle and spread laughs and just made fire mage do some good damage during combustion only with huge spam. But also not be an absolutely spamable thing.