Ich bin 5 und lerne Shogi. Kannst du mir sagen, wie ich Profi-Shogi-Spieler werden kann?
Shogi is a very fun game that anyone can learn at any age. Here is some steps you can take to improve your Shogi skills:

Step 1: Find a friend who'll commit to learning the basics and playing with you once a week.

Playing shogi is like learning a foreign language. You can do it on your own without anybody else, but most people will have a hard time focusing and figuring out what they need to practice.

Playing online or against computers doesn't really cut it for complete beginners. Even the easiest are still too hard to be beneficial at this stage.

Step 2: Learn the basics.

Hidetchi's channel is pretty much the go-to for learning the absolute basics of shogi.

Step 3: Practice tsume (mate) problems.

The hardest part about shogi, coming from chess, is wrapping your mind around the new move sets and dropping pieces. Tsume problems are great for learning them, as well as learning to recognize pieces by setting the problems up on the board while you solve them.

Good books in English are "Tsume Puzzles for Japanese Chess" and "Which pieces do you need to mate?" (both available on Amazon). Once you get the hang of the notation, you can pick up Japanese tsume books from Nekomado and solve them without any issues. Start with 1-hand problems and work your way up to 3-hand+ problems as they get easy.

Step 4: Pick an opening style and start to learn it.

Shogi openings fall into two camps, static and ranging rook. Pick one of these, and start to learn its corresponding josekis (opening lines) and castles. It doesn't really matter which you choose, but having a firm handle on one of them is a prerequisite for being able to play online.

Wikipedia is honestly your best resource for this. "Joseki at a Glance" (available from Nekomado) is also a very good way to quiz yourself on them.

Step 5: Start watching games with commentary.

It's good to see how better players assess shogi games. Hidetchi's famous games playlist is pretty good, though, because it was made when youTube limited video length to ten minutes, it feels rushed.

After this, I couldn't tell you. I would assume it involves getting better at the midgame, and continuing to expand your knowledge. You can also start reading the few books on shogi in english, or hunting down websites on it.