Ok, then start crediting Trump for everything that went well from 2017-2020. He was the one who was there, he did those things. You're not allowed to even speculate that any of it might have happened without him.
To clarify, we should credit a president for what they
did, but not necessarily for
what happened. Although that is perhaps an ideal, and in many cases presidents will end up being better or worse received because a lot happened to go right or wrong for a country during their time in office. Just as a note, I also think a president can't claim credit just for slapping their signature on the bottom of legislation, because that's a routine job expectation. They can claim some credit depending on their active involvement in drafting or supporting bills.
That judicial/prison reform bill seems to have been well received, and he weighed in significantly on that. The obvious problem we have in assessing Trump is that a lot of what he did will not have shaken out in the long run. For instance, there were major foreign policy changes - it's nearly all too soon to say. The tax cuts were big, but whether they were a success in a wider sense seems mixed or unclear. There's Space Force. He stuffed SCOTUS, but that's both exceptionally partisan and too soon to say. He finally pulled the USA out of Afghanistan (even if it occurred under Biden). Sure, it was painful in the end, but lancing boils often is. He also got some ISIS leader killed, I guess. I'm sure there was also a load of relatively minor stuff that was also fine to good, because governments do an awful lot to take notice of it all.