Get creative and find places to promote your services with low competition.
Like the Facebook groups that was mentioned, there are several Telegram and Discord groups with entrepreneurs of different kinds that need VAs.
Search for groups in different niches. Affiliate marketeers/SEO's/OnlyFans Agencies/Social media Agencies etc.
You can also find potential prospects through youtube videos. For instance, a lot of affiliate marketeers run Youtube channels about their work, other affiliate marketeers follow them and they all use VAs.