What are some good high fantasy mecha animes other than Dunbine, Escaflowne and FFS. Break Blade is kinda in that category too, but I wouldn't call it "good".
Isekai no Seikishi Monogatari, but it's more harem/SoL than mecha.
Even if you don't like the soap opera parts, the combat choreography and underlying strategy are pretty good. Its a more thoughtful take on the idea of "What if a new disruptively more powerful weapon were to be fielded" where it's not gundam overpowered, but it's used as a thoughtful part of fights with combined forces.
also seconding Galient. it could have been much better if it didn't try as hard to push toys but it's still entertaining
Solatorobo's not an anime, but it's pretty clear the developers were trying to make it feel like one.
Ryu Knight has fantastic mech designs and starts really strong, but I've heard the opinion of maybe one person who DIDN'T think it burned its potential in the second half. Though, it's sometimes disagreed on what was better in that part and what was worse.
Do be warned, though, that there's one guy who always responds with it being "not /m/" when it's discussed. Ignore him if he ever shows up.
I liked Maze, but I don't know if that's just nostalgia talking.
Maze is the most 90's anime ever made. It's charming in its own, schlocky sorta way.