As a builder/developer, marketing often isn't considered "fun". But you need to do it, else the build was for your personal entertainment/learning exp (which is sometimes a good thing).
What I do is stop building and focus 100% on marketing - well, 90% because I can't help myself. Even if this isn't as "fun", you need to switch modes and stop building.
As for my approach, I start with Google Ads + SEO/AEO. Google ads can get results in a few weeks (Google does have a learning phase) and SEO and AEO is a much longer process, which can be months before you see results. I use AHREF to check my SEO/AEO progress. While AHREF isn't a direct measurement of Google, I've found their DR to be correlated with my organic traffic.
The 90% is relatable, I physically cannot stop building even when I know I should be doing something else. The mode switching is the hardest part, not the marketing itself.
Good reminder that ads can show results fast while SEO compounds slowly, running both makes sense.