Actually, he accomplished quite a lot without having control of Congress and 6-3 activist SCOTUS.
And no, Manchin and Sinema didn’t give Democrats control of the Senate in 2021-2022 and changed parties since then.
Trump’s only success with full control of Congress was to pass the horrible tax bill.
Biden’s also extremely successful on the foreign policy. Not only he reunited NATO (Putin attacked Ukraine, because he was convinced there’s no way he can do it), but also got two additional members to join, who historically were neutral.
Biden’s major weakness is that he doesn’t broadcast his successes well and media doesn’t do that either for him. The only time he successfully did mention his accomplishments was during state of the union.