To make your shifting easier, here are four suggestions.
1. Add to or illustrate your point. Use also, and, moreover, or, similarly, for instance, another thing, furthermore or some other word or phrase.
2. Summarize what you've already written. Use words such as finally, to sum up, in summary, in conclusion, thus, in brief, so, or at last.
3. The element of time makes a good transition. Here's where you can insert words such as later, now, then, until, after, afterward, at once, frequently, occasionally, soon, or sooner. Here's an example of how this works. I ate breakfast, then I went for a three-mile walk.
4. Cause and effect. You probably do this often without realizing that it's a shift in thought: because, as a result, as a consequence, therefore, or thus.
I continue to learn ways to make my writing smoother
by writing transitions.