Welcome to Meta @Fma965
Add this to the common > header
tab of a new theme component, then add that component to your theme.
<script type="text/discourse-plugin" version="0.8">
const { on } = require("discourse-common/utils/decorators");
api.modifyClass("component:topic-list-item", {
@on("didInsertElement")
_changeExcerptLink() {
const excerptLink = this.element.querySelector(".topic-excerpt");
if (excerptLink) {
excerptLink.href = this.topic.lastReadUrl
}
}
});
</script>
Clicking the excerpt will then take the user to their last read post.