Aim higher! But how do you improve?

To improve at a beginner level: Start with a minimum of study time and a maximum of practice. Gain some personal experience. Read up on tactical motifs. Learn to apply them in your games. Learn some chess principles that you can apply like rules of thumb.

A beginner needs to learn to move the pieces like they were going to cross a road. Is it safe for the piece to land on that square? Is the piece ready to move on or is it already tasked doing something else? Will it be able to move elsewhere, if it falls under attack? Combinations happen when pieces start battering up on a square. So how often is that square attacked compared to how often is it protected? So many questions to solve in a Blitz game. This is why chess must become second nature before blitzing. Play slow games , so you can take the time to absorb the knowledge that you could gain from one match.

Increase your study time only as your rating increases.
Look at you chess insights for guidance. It will help you discover which opening you actually do the most and which one you succeed the most. Share your insights data with your friends so they can help you out. They might look at your most common opening, search for a trap and play it. If you see it great, if you don't you will learn from it.

When you start feeling like your an expert, you should be balancing your time equally between study and practice.
Every game should then be analysed during your study time.
At that level, a player usually has a favourite opening and must learn more than just the main lines. If you like an opening, then find games that GM's play and learn from their games.

Step 1:

Watch masters play.
Watch videos on openings and commentary of master games.
Learn the terminology.
Do puzzles.
Play as many games as you can.

Step 2:

Everything in Step 1 + now you can understand what's in books so...

Read the classics / recommended books as much as you can.
Read actively - work out the puzzles, visualize the position changing as you read, work with a side board if you have to but try to do it in your head more and more as you go

Step 3:

All of the above, plus start playing in tournaments

I don't know what step 4 is, because I'm pretty much somewhere in step 3 now, but I'm limited to the online tournaments because I don't know of any chess clubs in Japan...most Japanese play shogi. :P

Oh, I also forgot, in Step 2 you should also start finding people to do game analysis with; play opponents that are willing to do post-mortem analysis with you after their games, or people willing to coach/instruct during a game, etc. The more analysis you do at this low intermediate level, whether from books or with people, is going to put more and more data into your subconscious that will come out as you play.

An old local Master told me, just dont make mistakes.

and he's right