How to get back!


You improve the same way anyone else improved. You coming back from a break doesn't change this. You get better (in most things in life, not just chess) through hard work, practice, experience and sticking with it long enough to get desired results.
If you are coming back to chess, then you might "re-learn" some of the ideas you knew quicker because you've already seen it before and it might jog your memory, but overall, you just keep working on your game the same as usual.