Yes, it is safe. I think you used snort.social to generate your keys and than bought a nip05 identifier from nostrplebs.com. Just go to your profile and in settings enter the nip05 that you bought. Than go to relays and add the most popular relays one by one, set them all to read and write and save your settings. Here's a list of relays:
wss://relay.damus.io
wss://relay.snort.social
wss://brb.io
wss://nos.lol
wss://relay.current.fyi
wss://nostr-pub.wellorder.net
wss://nostr.bitcoiner.social
wss://nostr.fmt.wiz.biz
wss://nostr.oxtr.dev
wss://relay.nostr.bg
wss://relay.nostr.info
wss://relay.nostr.ch
wss://nostr.mom
wss://nostr.semisol.dev
wss://nostr.zebedee.cloud
wss://nostr.relayer.se
wss://relay.nostr.band