A good conclusion

restates
the central claim and
summarizes
key reasons that support the claim.

In conclusion, the central claim that [insert claim here] is strongly supported by several key reasons. First, [insert reason here] demonstrates how [insert claim here] is a valid argument. Additionally, [insert reason here] further solidifies the central claim by highlighting [insert supporting evidence]. Finally, [insert reason here] emphasizes the importance of [insert claim here] by showcasing [insert relevant example]. Therefore, based on the plethora of evidence and sound reasoning presented, it is clear that [insert claim here] holds true.