（この文は、”もっと”楽しくなるために、とこどき他の使える言葉を書きます） "[ ]" means the word is optional, but is also helpful for sounding like a native speaker.

Today was tiring!!  << You can also say "exhausting"! 「exhausting」が人々はよく言っているし、もっと楽しいんです

Today was very tiring, because I'm looking for a job. << 小さなchanges... 他の話し方は："Looking for a job is [definitely] tiring."
I went to there in a suit.  << 安い間違いです。英語で話す時、continue saying "went to" or "go to"..  もっと”安全な”選びですからね。これは難しい説明で、オンラインで使う説明を探してはいいと思います。
It is difficult to find one`s thing that I wants to do. << 意味がわかります。他の話し方は： "It's hard to figure out what one wants to do [isn't it]", or with a slightly different meaning, "It's been [so] hard to figure what I want to do [for work]" <<< "isn't it" is similar to saying ”ですよね！” or ”と思う”

So I`m going to go to bed. << Great use of "going to go"!! プロのみたい
goodnight.

頑張って続けてくださいね！

I got so tired today!!

Today I got very tired because I was looking for a job.
I went there in a suit. (or "wearing a suit")
It is difficult to find what you want to do.
So I`m going to go to bed.
Goodnight.

There→　it would be better if you explained, where did you go. work interview? random companies?

The grammar is broken, but people can understand what you mean by it.