I would just stick to the topic.

我只想紧扣主题。

youdao

Stick to the topic; do not make irrelevant remarks.

坚守主题；不要说一些不相干的话。

youdao

On the basis of this, the article explains why the previous studies stick to the topic of capital employing labor;

在此基础上，说明了以往的研究把资本雇佣劳动作为论题的原因；

youdao

Stick to the topic.

FORBES: Peggy Post on Workplace Etiquette

Here at Mixed Signals when we get a lot of comments on a post we like to stick with the topic (or, depending on your point of view, flog it to death).

NPR: First Couple Divided Over National Anthem

The rule of thumb I try to follow when creating internet videos is this: stick to one idea, one topic and one main point, and say it as briefly as possible without leaving out all of your good stuff.

FORBES: How long should an Internet video be? -media training