Hi @rishaja
Welcome to QuickSight Community .
Either you can write custom sql in QuickSight to limit the data to last 8 weeks as shown below or you can have view in Athena with similar filter conditions to limit the data in SPICE.
SELECT * FROM "cid_cur"."cur" where bill_billing_period_end_date > ( current_date + interval '56' day)
Please check the below community post for additional details.
Thanks
VInod