I am also a native English speaker and can also say they are all possible sentences. The first two are more polite as they acknowledge a different possibility. The third and fourth are more commanding. They are orders. If you wanted to be even more polite you could add "I think it would be better this way." by adding "I think" you are saying this is your opinion. Let me know if you have more questions.

No obvious question here. . I provide corrections. All are correct, except for minor things, probably unrelated to your question. 1) It's better this way. Start with a capital letter. End with a full stop. 2) It's better like this. Start with a capital letter. End with a full stop. If this is a question, then no space before "?" It's better like this? 3) Do it this way. Start with a capital letter. End with a full stop. 4) Do it like this. Start with a capital letter. End with a full stop. All good in concept.

Native English speaker here--they all work! It's a matter of preference.