Looking for advice on stats

Hey yall. I'm still somewhat new to the game. I've had a few games go to day 80 but I usually end up losing interest over lost momentum or i take a big loss i am not comfortable with just yet.

I'm still playing in beginner beginner high funds to.

And part of what I think i need to learn is how I should allocate my stat increases dependent on the role. I understand that if your gonna have a guy in the front MDEF and MATK are no brainers but I think I need to know what stats I should increase per the role. Like I just rolled an amazing retired soldier tank. Had 11 MDEF 3 stars but I ended up losing him because he just fatigued out and couldn't get the shield up.

Anyways, let's get to the point, what stats should I prioritize per what common role? I have the basics covered but I'm trying to learn what stats I'm missing out increasing, that or what benchmarks I need to look for for what role.

Thank you guys for your time