Nostr will probably take off faster when it can market to the outside world naturally via direct linking or watermarking. Memes is one way to do it. Another through referrals, "made with" links, and of course shared social links.

Creating tools for creators will also speed things up because those people are much more receptive if they see an opportunity to earn an income.

Don't overlook easy sharing functions. People are not always going to copy / paste URLs.