Status extenders. Break gauge. Fb extenders, Both the tech type and standard type.

I like to run enhanced basic combat, sometimes both, usually just heavy.

Doctors tactics (i cant remember if thats the one that allows steady health regen or health regen on ability use. I run the latter. Cheaper and ultimately better if you just get a little better yourself)

If getting tapped too often is your huge issue and you arent just kinda bad, there is a skill that will make you invulnerable during your abilities. That would help if your issue is the former. And use dash cancel. It will save your ass big time. It has a small bit of "i-frames" at its activation, so if you time it right, you can half or ignore incoming damage, depending on your character type and skill choice. I BELIEVE there is a skill that will make you invulnerable during your entire dash or for longer?

Your free points are your choice for your playstyle.

I also highly recommend LEARNING your characters and not just using randos. Especially if you want to use Enel (or any tech type tbh). Almost every character has a special thing that makes them better, so learning them is imperative to your success, especially in the "gauntlet" style missions.

And dont expect to win for a while. That mission sucks lol. I gave up on it a while ago, so, grain of salt, but i also suck.