So when it comes to the use of grammar due to the tricky nature of the English language one can be subject to certain blunders.
What makes these blunders kind of easy to make is the fact that these sentences sound right and correct while in use. In terms of proper grammar, that conclusion is far from the truth.
The correct words/phrases while talking or writing contrary to these are :
“Let Alone” this phrase substitutes for the usage of the phrases “Talk more of, Talk less of” which are completely wrong.
“Oftentimes/Most times” not “Most at times /often at times” we mostly make the mistake of saying the latter because we feel it qualifies and specifies but it’s totally wrong also. Without the “at” the adjective is still properly qualified.