1. Once you have written it once, repeating the motion doesn't help you memorize it because it's in your short term memory. Memory research has shown that it's more efficient to review information when some time has passed.
2. There's no system that builds on the graphical similarities of the characters, or based on the frequency of said characters. You will get thematic grouping of 冷 (extremely common word meaning cold) and 霜 (a more rare word meaning frost)
In Chinese classes in China for foreigners they similarly just tell you to write the new character. There's no explanation of radicals or whatever, just some stroke order considerations (which is the least important info) and sometimes the character composition when it's not obvious.
The way that people who research the topic learn characters is far better - use an app that tells you to write in the correct character in a time-based repetition manner split by most common characters. Even better would be to build up characters by common shapes (not necessarily radicals since a lot of common shapes are not radicals)