I have created aws account in 2021 but didn't provide payments details like credit card. Also didn't use the aws account. If I provide payments details now do, I am eligible for free tier services?

Based on the information provided, your AWS Free Tier benefits begin on the date you activate your account, not on the date you created it. Since you created your account in 2021 but never fully activated it (by adding payment details, verifying your phone number, and choosing a support plan), your Free Tier period has not yet started.

If you provide payment details now and complete the activation process, you should become eligible for the AWS Free Tier benefits. The Free Tier runs for 12 months after you activate your account, not from the creation date.

To fully activate your AWS account and start benefiting from the Free Tier, you need to:

1. Add a valid payment method to your account
2. Verify your phone number
3. Choose an AWS Support Plan

Once you complete these steps, your 12-month Free Tier period should begin, giving you access to eligible AWS services within the Free Tier usage limits.
Sources
Understand when AWS Free Tier starts and expires | AWS re:Post
No free tier visible | AWS re:Post
Free tier do not show any service when create new account | AWS re:Post