I went ton a business trip today for a presentation of our businessfor works to get a new contract. I went on a business trip today for a presentation for work to get a new contract.

Because you said "business trip", "business works" is not needed.

I went ton business trip today for a presentation of our business workswork in order to get new contract. or I went on a business trip today to do a presentation in order to try to get a new contract. I went on business trip today for a presentation of our work in order to get new contract. or I went on a business trip today to do a presentation in order to try to get a new contract.

I went ton a business trip today forto give a presentation of our business worksabout my company’s products in order to get a new contract. I went on a business trip today to give a presentation about my company’s products in order to get a new contract.

By “works”, I assume you mean a product or some kind of service?

I went ton a business trip today for a presentation of our business works to getsecure a new contract. I went on a business trip today for a presentation of our business works to secure a new contract.

for clarity

Although the customer showed some interest, I didn't feel good attention from customerthe customer was really paying attention. Although the customer showed some interest, I didn't feel the customer was really paying attention.

Although customer showed some interest, I didn't feel good attention from customerin the end I didn't convince them. Although customer showed some interest, in the end I didn't convince them.

It is unclear to me what "I didn't feel good attention from customer" means. I am assuming it means you didn't get the contract.

Although the customer showed some interest, Ithey didn'’t feel good attention from customegive the response I had hoped for. Although the customer showed some interest, they didn’t give the response I had hoped for.

Not sure what you intended with “feel good attention” here. I interpreted it as either the customer didn’t give the response you hoped for or responded negatively in some way to the presentation.

Although the customer showed some interest, I didn't feel good attention from customer.that they aren't paying any attention Although the customer showed some interest, I didn't feel that they aren't paying any attention

"the" to make it specific

I need to improve my suggestions until nextnext time. I need to improve my suggestions next time.

I assume you mean in the future like 次回

I need to improve my suggestions until next. I need to improve my suggestions until next.

I need to work on my presentation for next time. or I need to improve my presentation for next time

I need to improve my suggestions until nextbefore the next business trip. I need to improve my suggestions before the next business trip.

A version where “until” could be used: - I’m going to work on improving my suggestions until the next trip.

I need to improve my suggestions until next.before our next meeting/business trip I need to improve my suggestions before our next meeting/business trip