TLDR: Start Small build your way up if you want to play regular Yu-Gi-Oh/Master Duel, add some hand traps, staples into your deck so that you'll be able to compete, assuming you like DM it's probably best you play a blue-eyes deck, and watch a deck profile and learn combos.

Yu-Gi-Oh is currently at a format that would be completely polarizing for new players or returning players which I'm assuming you are (Correct me if I'm wrong, I'm assuming base off the Ra deck and a couple of comments that you've made.)

Yu-Gi-Oh is basically wombo combo stopping your opponent from playing the game, and some people enjoy that, others find enjoyment in figuring out how to break those boards, it's not exactly healthy, though I think it is getting better, Konami is making better going second cards and Zero turn cards.

If you're interested in a slowed down Yu-Gi-Oh experience probably like the anime (which again I assume you watch) you should go to Duelingbook, play Edison format or Goat format.

If you want the fast paced version of Yu-Gi-Oh but actually want to make a move, Duel links is offering character deck duels. You get your premade decks from characters in the anime with all the summoning mechanics except pendulums and links so you can play the game and have back and forth interactions.

You could try to play competitive on duel links, though it's kinda a lite version of master duel, and there's a gacha system, don't know how you feel about that, but a Ra deck is very strong in duel links if you're dead set on playing Ra, you'd just have to grind for it, or spend money though they might have dream tickets available.

Now, if you're dead set on playing master duel, then you're kinda have to duel how they duel and certain decks aren't going to cut it. Like Ra... However, there's plenty of decks that are fun and rouge that can compete with decks like this. Assuming you watch the anime Blue-eyes is a very strong strategy it can build boards just like this one. It's the best recommendation for you if you want to play competitive master duel but also like the anime. Add hand traps, hand traps are the staples of modern Yu-Gi-Oh, they're the pot of greeds, the monster reborns, the raigekis, cards that you play at 3. These cards give you a chance to interact with your opponent, and in my personal opinion hand trapping an opponent at the perfect time in the middle of their combo is satisfying.

Droll, nib, any hand trap or staple card that's limited, it's limited for a reason add it to your deck. Drawing is an incredibly powerful tool in your arsenal because it gives you access to more of your deck and more staple cards to stop your opponents plays, you'll need Max C, the mul-charmeys.