The two best upgrades for any rifle are to have more ammo, and to have shot more ammo.

If your training budget is cash rather than time limited, I'd say you want one reliable rifle (you're there) and then allocate resources to being good at using it.

Pistol course probably does have more immediate value that a carbine course, but get a basic one of each ASAP. There really is very little "advanced" material. Your goal at the course is to learn exactly what movements to practice, and how to practice them correctly.

Real skill then comes from taking that knowledge and actually practicing -- 99% of that can be done in your basement without expending any ammo. Individual skills are mostly a question of building muscle memory.

Once you get that down then it's less about becoming a better shooter and more about learning basic tactics, how to coordinate with other people, etc.

A stop the bleed course is definitely a good idea. You are probably more likely to save a life that way than with a gun, statistically speaking.

Survival training depends on your area. Any chance of finding yourself innawoods? This is an area with lots of good books available, and you can safely just go try the skills. It's harder than it sounds to start a fire in adverse situation though, so you do want to get some hands on.