There is no algorithm on here deciding what you see. You can follow and like and boost whatever you want, you don't need to worry about it having any unexpected effects.
Your Home timeline just shows all posts and boosts from all accounts/hashtags/groups you follow. It's entirely in your own hands to curate your timeline.
You can split your timeline into themed mini-timelines using Lists https://fedi.tips/how-to-use-the-lists-feature-on-mastodon
You can mute just an account's boosts https://fedi.tips/blocking-and-muting-on-the-fediverse/#JustBoosts
Blocking and muting accounts on Mastodon | Fedi.Tips – An Unofficial Guide to Mastodon and the Fediverse
An unofficial guide to using Mastodon and the Fediversefedi.tips
