Improve my chess skill?

I have been in the 1300 - 1400 range for quite a while. Upon advice of members I had recently switched to 30 min games which gives me time to think and analyse. 

I also analyze each game afterwards with Fritz engine. I could well see the mistakes I made and the effectiveness of the alternatives that the computer showed me. But every new game brings different possibilities and I am back again making similar kind of mistakes without knowing it. One point is to reduce the blunders which is obviously tackled by careful checking and analyzing candidate moves but picking an excellent move out of 3 or 4 moves is an issue which I am not able to fully comprehend. 

I see it all after the analysis but see nothing during the game.

You might want to take this with a grain of salt because I'm not much better than you (if at all), but I stopped/or cut way down on playing live games (especially blitz), and focussed on Daily games (one game at a time). After a few months my Daily rating climbed to ~1750. Once I started playing live chess again (mostly blitz because I rarely have time to sit and play long live games), my previously stagnated blitz rating went up about 250 pts.

In the daily games you can use the analysis board and deeply investigate the positions, and see how candidate moves affect it. After dong this for every move through many games, your understanding improves to the point where your 'intuition' actually becomes useful. It's a good way to help learn the game.

interesting.  I've had nearly the opposite results, that being when I focused on Online chess- my Live ratings didn't move much and when I came back to standard I started to inch forward.  focusing on blitz didn't help me either.

I think that blitz, even G10,everything is Very focused on time.  there simply Isn't time to look for the best move most of the time... so improvement in blitz is when to look and when not to, and when to play from intuition and Hope chess so you have the better clock score.,

that habit Isn't helpful in Live or OTB.

On the other hand, big attentions to Online games, usually means less studying and more meticulous, laborious analysis board calculations.  I don't think that helps So very much as well- espacially if you lose your time you need to study endgames from a book, read anotated games and do tactics puzzles.

in short, I think the OP is doing it right with G30 games; analyzed. and my experience is only that the more analysis HE does the better. its oc ok to have fritz look for stuff.  but fritz moves means nothing unless you understand them.

also and seperately; tactics puzzles, endgames, and other instructive activities.   and measured limited blitz, online games...

 

Never had that perspective. Thought daily games were too slow and didn't had the patience. Will start trying them. Also reading 'The Amateur's mind'. 

good book.one of silman's best.

you never said what you are doing with tactics?

thats really key.  alot of people claim they don't need tactics because they can solve the puzzles.   but you need instant recognition of typical motifs; it REALLY helps analysis.   Otherwise your forever calculating and missing the point of your analysis.

anyways, if you read silman, you will read that he assumes tactical competence in his readers/students. 

When I was at your level, reading chess books helped me improve. With a combination of books (and a lot of playing and reviewing), I've moved up from 1300 to 2100 in a few years.

Irving Chernev's Logical Chess, Move by Move and Neil McDonald's Chess: The Art of Logical Thinking are two that I recommend you pick up, to help start you on your way. In it, grandmaster games are annotated, with the thought-process behind each move explained.

A positional book like Nimzo's My System is also invaluable. Do you know where your rooks belong? How to play with (or against) isolated queen pawns? Do you know what a minority attack is, and how to play with it, or against it? My System is a bit advanced, but exposure to the ideas in it will get you headed down a strong path.

Silman's books are also good resources.

Playing chess and understanding chess are two different things. There are a lot of ideas out there—many of them useful. But you won't find most of them by only evaluating with an engine. You can find improvement with the help of books!