The most meaningfulimportant thing in my life, apart from my family and relatives, is to get to know some bosomhave some true and steadfast friends.

Like you want to inform them a little biThe kind that you would contact when you are going to die, aleven though you rarely getstay in touch.

Speaking of regret things, in addition to that things cannot be said out, it is probably that I wasn’t persistent in many things and most of the time I gave up.

I cannot correct this because I'm not sure how this paragraph fits in with the one regarding having close friends. You should try to keep the topic to one for each journal.

I lack sort of persistence and perseverance.

The most meaningfulimportant thing in my life, apart from my family and relatives, is to get to know some bosomclose friends.

I've never heard of the term "bosom friends" perhaps it's an older phrase.

LikeFriends like when you want to inform them a little biton things. For example, when you are going to die, althoughyou want to tell them but you are rarely get in touch with each other.

Speaking of regretful things, in addition to that things and things that cannot be said aloutd, it is probably thatbecause I wasn’t persistent in many thingskeeping constant contact and most of the time I gave up.

I lack this sort of persistence and perseverance.

The most meaningful thing in my life, apart from my family and relatives, is to get, is getting to know some bosomclose friends.

"family and relatives" is basically equivalent to "family and family".

Generally it's best to avoid the word "bosom" since it also means "breasts". We'd get laughed at in school if we said "bosom friends".

Like, you want to gently inform them a little bitof when you are going to die, althoughbut you rarely get in touch.

(This is puzzling...)

Speaking of regret things, in addition to thatose things cannot be said out, it isthat I cannot say openly, one regret is that I probably that I wasn’t persistent enough in many things, and most of the time I gave up.

It's hard to understand the meaning here. I tried to fix the English with my best guess as to what it means.

I lack sort of lack persistence and perseverance.

Be aware that "sort of" here is informal. It's suitable if you were having a conversation with someone else.