Keep your follow list to people and things you truly enjoy, visit curated relays for stuff beyond your follows, stay out of anything called "global", "trending", or "universal", use a client that supports NSFW filters, shut off video autoplay just in case. If unpleasant things start showing up in ypur replies, you can mute and/or change your inbox relays as needed. Nostr offers better tools for you to control your experience than any platform.