I like to travel, and I would like to rent out tor buy a motorhome . I like to travel, and I would like to rent out or buy a motorhome .

This may have been a typo, but introducing a verb after "to" suggests that it is the purpose of the previous action. "Rent to buy" is indeed a phrase, but there is no "out" there and it's specific to certain types of situations.

I like to travel,. I would like to rent out to buy a motorhome . I like to travel. I would like to rent out to buy a motorhome .

These are two independent clauses. They need to be either two separate sentences or connected by a conjunction ("and" here).

I like to travel, I would like to rent out tor buy a motorhome . I like to travel, I would like to rent or buy a motorhome .

I like to travel, and I would like to rent out tor buy a motorhome . I like to travel and I would like to rent out or buy a motorhome .

I think , one day this virus will be awayone day be gone!! I think this virus will one day be gone!!

This placement of "one day" is more idiomatic to me. "Away" suggests that it might be back, so "gone" is more appropriate.

I think ,hope that one day this virus will be away!! I hope that one day this virus will be away!!

I think , one day this virus will be away!!over! I think , one day this virus will be over!

I think ,hope one day this virus will be awayfinally be over!! I hope one day this virus will finally be over!!

'Over and done with' would be the full expression.

I would like to staypend three months in the USA. I would like to spend three months in the USA.

Or: "I would like to stay in the USA for three months."

I would like to stay for three months in USA. I would like to stay for three months in USA.

I would like to stay for three months in USA. I would like to stay for three months in USA.

I would like to stay in the USA for three months in USA. I would like to stay in the USA for three months.