My English level is very bad. My English level is very bad.

My English level is very bad. My English level is very bad.

Make sure you don't forget a verb in every sentence. Otherwise, I disagree, your English level is pretty good. Keep working at it!

I wantDuring this summer holiday, I want to improve my Englhısish level increase. During this summer holiday, I want to improve my English level.

I want summer holidayto improve my Englhısish level increaseduring the summer holiday. I want to improve my English level during the summer holiday.

Or: "I want to use my summer vacation to improve my English"

I wantOver the summer holiday my Englhıs level increaseI want to improve my English. Over the summer holiday I want to improve my English.

For this ı canThis includes readıing , writıing, and listenıing and increase studiesto English more. This includes reading, writing and listening to English more.

Its a bit unclear what you want to say here

For this ıI can readıng , writınge, listenıng and increase my studiesy time. For this I can read, write, listen and increase my study time.

can + verb does not use -ing verbs: I can read [good books]. I can write [on langcorrect]. I can listen [to podcasts]. I can speak [with native speakers]. I can watch movies [in English].

For this ı canI will practice readıing ,writıing, listenıing and increase my studies. For this I will practice reading ,writing, listening and increase my studies.

About improving my self ı can sguusentıPlease leave helpful suggestions. Please leave helpful suggestions.

AI am open to suggestions about improving my self ı can sguusentıon. I am open to suggestions about improving myself.

APlease give my suggestions about improving my self ı can sguusentıon. Please give my suggestions about improving myself.