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

for clarity

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

"the" to make it specific

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

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.

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

Although the customer showed some interest, Ithey didn'’t feel good attention from customegive 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.

I need to improve my suggestions until nextbefore 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 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.

Although customer showed some interest, I didn't feel good attention from customerin 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.

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

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

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

I need to improve my suggestions until nextnext time.

I assume you mean in the future like 次回