mMy heart is so tired. My heart is so tired

You don't need ending punctuation in a title, but you should still capitalise the first word. "My heart is so tired" is a bit strange, but it's OK as a title I think, though this is perhaps up to personal preference.

mMy heartSoul is sSo tTired. My Soul is So Tired

I capitalised this in the style of a title. I changed "heart" for "soul" (魂) because "my heart is so tired" sounds like you're very sad. "My soul is so tired" sounds dramatic, but sounds more like you're physically tired. Some other options: "I'm so tired" "I'm dead tired" "I'm bone-tired" "I'm exhausted"

I felt'm very tired. I'm very tired.

You can say "I feel tired", but it makes it sound weaker.

That's because I attended a track and field match makes me ievent. That's because I attended a track and field event.

- Generally, 'because' should not really start a sentence - it doesn't work the same as なぜなら or 理由は. If you use because, it would be good to combine it with the previous sentence - 'I felt very tired because I attended a track and field event'. - You would use 'match' for a soccer match or a basketball match, but for track and field, you might say a 'race' or an 'event'. - The first sentence is in the past tense, but the second is in the present tense - you should be consistent, so this is better as past tense. - You could say 'track and field makes me tired', but 'track and field makes me it' feels unnatural (even though I understand it).

becausThe track and field match makes me iteet (wore me out/exhausted me). The rack and field meet (wore me out/exhausted me).

I will have a delicious dinner today. I will have a delicious dinner today.

I will'm going to have a delicious dinner today. I'm going to have a delicious dinner today.