RLately I dohaven't haved motivation. Lately I haven't had motivation.

(1) "Rately" and "lately" sound similar, don't they? However, "rately" is not a word! (2) "Don't have" is what is known as the "present simple tense". However, since "lately" actually refers to the past, we cannot use the "present simple tense" with it. Meanwhile, "haven't had" is known as the "present perfect tense", and can be used with the word "lately". Tenses in English can be very confusing, so don't worry too much if you can't understand them yet...

RLately, I don't have motivation. Lately, I don't have motivation.

Or "I don't have energy"

RLately I don't have motivation. Lately I don't have motivation.

RLately, I dohaven't have ad motivation, because I have a lot of things to I should do. Lately, I haven't had motivation, because I have a lot of things to do.

"Motivation" can be both countable (動機) and uncountable (モチベーション). When used in this context, it is uncountable, so we do not add the "a".

RLately, I don't have a motivation, because I have a lot of things to I should do. Lately, I don't have motivation, because I have a lot of things to I should do.

RLately, I don't have athe motivation, because I have a lot of things tohat I should do. Lately, I don't have the motivation, because I have a lot of things that I should do.

I don't have powor of answering for yours answeringenergy to respond to your comments. I don't have energy to respond to your comments.

I don't have enough powoer of answering for yours answeringto reply to your corrections. I don't have enough power to reply to your corrections.

I don't have powor of answering for yours answeringenergy to respond to your replies. I don't have energy to respond to your replies.

RLately, I can'thaven't been able to sleep enough... Lately, I haven't been able to sleep enough...

Again, the "present simple tense" cannot be used with "lately".

RLately, I can't sleep enough... Lately, I can't sleep enough...

RLately, I can't sleep enough... Lately, I can't sleep enough...