Build your own relay step by step without relying on anyone:

https://v2.minibolt.info/bonus-guides/bitcoin/nostr-relay

Connect to your new and personal nostr relay and broadcast your previous events to it using https://nostryfied.amethyst.social/, and follow the steps outlined in https://v2.minibolt.info/bonus-guides/bitcoin/nostr-relay#broadcast-the-past-events-to-your-new-relay-optional

Select the relays to connect to based on the relays obtained through Nosy at https://nosy.tigerville.no/. Aim for a balance between 'Followers' and 'Follows' results, **and avoid choosing them solely based on their popularity or prestige if they do not align with the ones selected by your network of contacts.**