If your Mastodon timeline is getting too crowded, you might want to split it into several themed mini-timelines using the Lists feature. More details here:
➡️ https://fedi.tips/how-to-use-the-lists-feature-on-mastodon
You can optionally set Lists to hide their posts from your main timeline, which makes it less crowded.
For example, you could create a sports-themed List for all the sports accounts you follow, and look at that List when you want to see the latest sports-related posts.
@FediTips
Also hiding boosts helps.