Questions about BLM DPS

[SoCalKingg]

Hello FF14 community. I recently reached lvl 50 and looking for tips from BLM experts. I've rarely died up until this pt but I know end game content is rough so looking to hone my dungeon/primal skills. Always looking to learn from the best. Here is what I'm currently using:

Single enemy - Thunder 3, Fire 3, followed by multiple fire spells until MP is ~700, ice 3. Rinse/repeat.

Multiple enemies pulled - Lock on to highest HP enemy, Flare, followed by transpose or convert, flare again. Rinse/repeat.

I always use Raging Strikes and Swiftcast for flare when available. I have physiks for healing if need be. What am I missing out on here or how can I change this to improve? It looks like some people use Thunder 1/2 vs 3. I'm guessing the shorter cast time is worth the minimal lost damage?

Thank in advance!