Just promoted to blue belt. 30 YO 6’4 240-250.

I’ve found my go to techniques are the general “big guy” moves. Usually comfortable with arm locks specifically kimuras. Also have had good success with kesa gatame. When playing guard I’ve been experimenting with butterfly and believe it could be useful for bigger guys.

Good luck

If you can not do sport-specific training more than 2x per week then work as much as you can on (in order of priority)

Mobility/flexibility
Aerobic conditioning
General strength training (but must not compromise mobility with it!)

Takedowns: Romulo Barrals game https://www.youtube.com/w[...]3TTT_oJsUM (basics of that I also cover here: https://www.youtube.com/w[...]U80Gu-Jykc)
Submissions: focus for now on what you feel works for you now the best, possibly subs that have lower risk of losing position are better (e.g. kimura over armbar) BUT in the long run development, reverse that principle - subs that make you LOSE position more actually help develop your overall game better.
Passing: learn to use your attributes for your advantage, train it on people your size
Sweeps: dependant on your mobility, see what you like. DO NOT get seduced by the trap of developing and focusing on the half / deep half game.

I am a purple belt that competes in Masters 4 Ultra heavy. Are you doing Gi or No-Gi Worlds?

If you are doing either one, you will need to do some serious cardio and a good strength program. I use an Airdyne and drag a tractor trailer tire for cardio. I do Stronglifts 5x5 for my strength program. I suggest that you try to add a wrestling or Judo class each week, or every other week. In our weight class, the one that gets the takedown usually wins. Part of your training time needs to be on serious gripfighting. It is essential. Also, and I cannot emphasize this enough, works your escapes and getting from bottom to top.

As far as submissions go, I use Kimura and a handful of chokes.

This!

And the one who pulls guard, usually loses.

Get on flograppling and watch the matches of the person who won your division the past couple of years. The UHW division can often be a battle of the bulls. At Master 5, you are definitely going to need to train smarter not harder as I don't think it would be feasible to train 3x a day. Strength train to increase joint health and reduce the likelihood of injuries.

Get comfortable with fighting from the clinch/Greco-Roman style tactics/judo if it is available to you.

I know you said you want advice beyond improving cardio and attending more classes, but do that too. Even though it is "only" masters, people take it quite seriously when it comes to putting in the funds/time to attend far off tournaments.

White and Blue belt are more like paper rock scissors as people are not well rounded yet.

Have a solid A game for all the realistic positions you may find yourself in. A set of strategies that your trying to force.

If your opponent happens to be able to counter what your A game strategy Is you need to be able to call an audible on the spot and have some sort of B game that your at least decent at. Don't force the A game if you realize your opponent is going to stop it. Figure out what their weaknesses might be.

- Figure out what your A game is.
- Figure out what type of opponent can counter your A game.
- Figure out ways to deal with those types of opponents and what your best options may be.

- Ex: I love open guard and open guard is great against most people. But really good wrestlers may be able to counter my open guard so I may need to switch to a closed or 1/2 guard at least briefly before attacking the open guard from a close distance instead of the normal longer distance.

At masters 5 you probably wont have to deal with the sandbagging that you would at adult or masters 1 so if you train hard you have a real chance as there also probably wont be more than a 16 man bracket at most. Probably closer to an 8 man bracket meaning you would only need to win 3 matches if this is true.

Also make sure your Gi can pass inspection. My backup Gi got 2nd at pans last year for one guy who's Gi didn't meet the requirements lol

Everyone is giving great advice, but in an effort to help you avoid being overwhelmed with so many recommendations, try to use these recommendations in your own reflection and learning exercise.

I recommend making a list of all of the suggestions being made, then set it down for a moment and ask yourself what you struggle with the most in training. What will have the biggest impact on your game that you can focus on within the time frame you have available. You can use peoples suggestions to give you ideas of a direction but you're the only one who can decide on what will have an impact.

Jiujitsu really is a marathon and largely comes down to time on the mat, but you can drastically improve and cut down on the time to reach your goals by being deliberate and learning about yourself and improving yourself in the ways YOU need (everyone needs different things from the art / sport).

Happy to go into more detail or brainstorm with you if you'd like! Just let me know.